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Lesson Plan
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\n\"Right\n\n
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\nIllustrative Mathematics\n
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\nRight Triangles Inscribed in Circles I\n

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\n\nFor Teachers\n\n9th - 10th\n\nStandards\n
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\nOne of the basic properties of inscribed angles gets a triangle proof treatment in a short but detailed exercise. Leading directions take the learner through identifying characteristics of a circle and how they relate to angles and...\n
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Worksheet
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\n\"Accelerated\n\n
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\nGeometry Accelerated\n
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\nAccelerated Geometry Review Sheet\n

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\n\nFor Students\n\n8th - 10th\n\nStandards\n
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\nYour geometry learners use their knowledge of various geometric concepts to write proofs. Starting with givens containing parallel line segments with transversals and triangles and quadrilaterals, and the mid-point and distance formulas;...\n
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Lesson Plan
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\n\"Angle\n\n
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\nWillow Tree\n
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\nAngle Sum Property of Triangles\n

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\n\nFor Students\n\n8th - 11th\n\nStandards\n
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\nAll triangles have some things in common. Using these properties of triangles, learners find missing angle measures. Scholars use the Angle Sum Property and properties of special triangles throughout the lesson.\n
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Worksheet
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\n\"Classification\n\n
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\nCurated OER\n
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\nClassification of Triangle Measurement & Perimeter\n

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\n\nFor Students\n\n10th\n
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\nIn this classification of triangles worksheet, 10th graders identify and complete 8 different problems that include determining the measurement and perimeter of various types of triangles. First, they color all right, acute, and obtuse...\n
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Lesson Plan
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\n\"How\n\n
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\nVirginia Department of Education \n
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\nHow Many Triangles?\n

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\n\nFor Teachers\n\n9th - 11th\n\nStandards\n
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\nSomething for young mathematicians to remember: the sum of any two sides must be greater than the third. Class members investigates the Triangle Inequality Theorem to find the relationship between the sides of a triangle. At the...\n
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Lesson Plan
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\n\"Common\n\n
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\nWillow Tree\n
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\nCommon Geometric Figures\n

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\n\nFor Students\n\n8th - 11th\n\nStandards\n
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\nGeometry could be called the study of figures. An overview of the figures found in a typical geometry course contains a study of different triangles, quadrilaterals, and regular polygons. \n
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Worksheet
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\n\"Isosceles\n\n
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\nCurated OER\n
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\nIsosceles Right Triangle\n

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\n\nFor Students\n\n10th\n
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\nIn this isosceles right triangle activity, 10th graders solve and complete 5 different constructions of composition and decomposition. First, they make 4 congruent isosceles triangles with the model on the left. Then, students create...\n
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PPT
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\n\"Classifying\n\n
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\nCurated OER\n
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\nClassifying Triangles\n

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\n\nFor Teachers\n\n3rd - 5th\n
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\nIf you're looking for a presentation to assist you in your teaching of triangles, this one could be for you. In it, learners are shown how triangles are classified by the size of their angles and by their sides. These are tricky concepts...\n
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Interactive1:45
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\n\"Study\n\n
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\nScholastic\n
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\nStudy Jams! Classify Triangles\n

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\n\nFor Students\n\n5th - 8th\n\nStandards\n
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\nJam on with this multi-faceted activity teaching triangle classification. Start with a learner-paced lesson describing the different qualities of triangles and follow with a fun karaoke session. Also provided are two types...\n
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Worksheet
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\n\"Squares,\n\n
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\nCurated OER\n
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\nSquares, Shaded Area\n

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\n\nFor Students\n\n9th - 12th\n
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\nIn this secondary mathematics worksheet, students are provided with a figure that consists of squares and isosceles triangles and must determine the percent of the figure that is shaded. The one page worksheet contains one problem with...\n
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Worksheet
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\n\"Triangle\n\n
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\nCurated OER\n
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\nTriangle Challenge\n

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\n\nFor Students\n\n7th - 8th\n
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\nIn this triangles worksheet, students identify and name 3 different types of triangles. First, they determine the number of right triangles in the figure shown on the sheet. Then, students determine the number of equilateral triangles...\n
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Worksheet
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\n\"Triangle\n\n
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\nCurated OER\n
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\nTriangle Angle Sort\n

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\n\nFor Students\n\n10th\n
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\nIn this triangle and angle activity, 10th graders identify 36 different angles and triangles illustrated on the sheet. First, they define the vocabulary to include equilateral, scalene, right, and isosceles triangle. In addition, they...\n
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Lesson Plan
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\n\"Geometric\n\n
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\nCurated OER\n
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\nGeometric Figures-Triangles\n

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\nFourth graders explore triangles. In this math lesson, 4th graders discuss the different types of triangles. Students create triangles using wiki sticks. Students complete an online matching game.\n
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Worksheet
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\n\"Geometry\n\n
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\nCurated OER\n
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\nGeometry Puzzle\n

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\n\nFor Students\n\n2nd - 3rd\n
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\nIn this geometry puzzle worksheet, students identify and complete a puzzle that includes 7 different geometrical shapes. They identify and name each shape listed at the bottom. Then, students label every shape in the puzzle with the...\n
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Worksheet
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\n\"Triangles\n\n
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\nCurated OER\n
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\nTriangles\n

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\n\nFor Students\n\n4th - 7th\n\nStandards\n
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\nWhy are there so many different types of triangles? Be that as it may, beginning geometers need to understand the differences between equilateral, isosceles, scalene, and right triangles, and they get a visual approach with this...\n
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Lesson Plan
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\n\"Geometric\n\n
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\nCurated OER\n
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\nGeometric Properties\n

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\n\nFor Teachers\n\n9th - 12th\n
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\nStudents find triangular angles using the angle theorem. In this geometry lesson, students describe labeled triangles, use the pythagorean theorem, and rewrite information about triangles in standard form.\n
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Lesson Plan
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\n\"Toothpick\n\n
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\nCurated OER\n
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\nToothpick Triangles\n

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\n\nFor Teachers\n\n4th - 8th\n
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\nStudents draw a chart (included in the lesson) to use with their investigation. They review terminology of triangles and receive toothpicks to use in the lesson. Beginning with three toothpicks, students form a triangle. They complete...\n
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Assessment
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\n\"Refiguring\n\n
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\nBalanced Assessment\n
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\nRefiguring Pythagoras\n

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\n\nFor Students\n\n6th - 8th\n
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\nWhy was Pythagoras so obsessed with squares? The assessment task posits the question of whether the geometric interpretation of the Pythagorean Theorem holds for figures other than squares. Scholars first consider the case of semicircles...\n
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Interactive
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\n\"Lengths\n\n
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\nCK-12 Foundation\n
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\nLengths of Sides in Isosceles Right Triangles: Paper Football\n

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\n\nFor Students\n\n9th - 12th\n\nStandards\n
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\nFuse sports and geometry by having your class create paper footballs—that are actually isosceles right triangles! Scholars use an interactive to create an isosceles right triangle to model a paper football. From the information in the...\n
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Instructional Video5:58
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\n\"What\n\n
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\nCurated OER\n
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\nWhat is a Triangle?\n

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\n\nFor Teachers\n\n1st - 5th\n
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\nTriangles, triangles, triangles. What makes a polygon a triangle? How many types of triangles are there? How do you determine what kind of triangle it is? Watch this video as the teacher explains 'tri' meaning three, making a triangle -...\n
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Assessment
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\n\"Rods\n\n
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\nBowland\n
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\nRods and Triangles\n

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\n\nFor Teachers\n\n6th - 9th\n
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\nScholars explore triangles with rods of different lengths. Using rods of 2, 4, 6, 8, and 10 cm class members build as many different types of triangles as they can. They also describe properties of these triangles and determine...\n
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Printables
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\n\"Triangle\n\n
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\nK-5 Math Teaching Resources\n
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\nTriangle Pack\n

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\n\nFor Teachers\n\n4th - 6th\n\nStandards\n
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\nWith so many different types of triangles, it can be a challenge for young mathematicians to keep them all straight. Luckily this set of printable triangles is here to engage children in comparing and sorting triangles by their...\n
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Instructional Video3:02
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\n\"Equilateral\n\n
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\nCK-12 Foundation\n
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\nEquilateral Triangles: Lesson\n

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\n\nFor Students\n\n8th - 11th\n\nStandards\n
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\nTake a second look at triangles that are equal all the way around. The video reminds viewers what an equilateral triangle is and points out that the three angles are the same. Using the fact that equilateral triangles are also isosceles,...\n
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Unit Plan
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\n\"Accessible\n\n
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\nPBS\n
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\nAccessible Shapes\n

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\n\nFor Teachers\n\n6th - 8th\n\nStandards\n
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\nAll the 2-D and 3-D measurement work you need is in one location. Divided into three sections, the geometry lesson plans consist of visualization of three dimensions, classifying geometric figures, and finding surface area and volume....\n
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