Worksheet
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Quiz: Direct Euclidean Proofs

For Students 10th - 12th
In this Euclidean proof worksheet, students observe models and read given proofs. Students determine conclusions based upon the given information. This one-page worksheet contains ten Euclidean proof problems.
Worksheet
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Line Reflections

For Students 10th
In this line reflections learning exercise, 10th graders solve 10 different problems that include determining different line reflections in images. They identify the line reflections in each of the illustrations shown on the sheet. Then,...
Lesson Plan
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"Sir Cumference and the First Round Table" by Cindy Neuschwander

For Teachers 4th - 6th
Young scholars analyze characteristics of various 2 dimensional shapes and explore their properties and use various vocabulary terms to discuss geometric relationships.
Lesson Plan
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Finding the Area of Regular Polygons

For Teachers 9th - 12th Standards
Students analyze relationship between the increase in polygons sides and a circle. In this geometry lesson, students relate the size of the central angle of a polygon, to a circle. They compare the formula for the area of a polygon and a...
Worksheet
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Seeing Solar Storms in STEREO-II

For Students 11th - 12th
In this solar storms worksheet, students use a diagram given the location of two STEREO spacecraft satellites, a coronal mass ejection, the sun and the Earth to solve 2 problems about the coronal mass ejection. Students use segments,...
Worksheet
Curated OER

Modeling Celestial Motion

For Students 7th - 12th
In this modeling celestial motion instructional activity, learners fill in the blank about the motion of celestial bodies: planets and stars. Students complete the blanks with information about the scientists and philosophers responsible...
Lesson Plan
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Measurement, Perimeter and Area

For Teachers 7th - 9th
Young scholars explore the concept of measurement.  In this measurement lesson plan, students collect data about themselves such as height, finger length, neck circumference, foot length, and other body measurements.  Young...
Lesson Plan
Texas Instruments

Cabri Jr. Inscribed and Central Angles

For Teachers 9th - 12th Standards
Learners will differentiate between inscribed and central angles in this geometry lesson. They answer questions dealing with circles as they relate to inscribed triangles and angles. This assignment includes a printable worksheet.
Lesson Plan
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Geometric Shapes

For Teachers 1st - 2nd
For this geometry worksheet, young scholars see a train design with the engineer. All are made with circles, triangles, rectangles or squares. Students read the directions about which color each shape should be.
Worksheet
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Constructions and Loci

For Students 9th - 10th
In this geometry worksheet, students construct polygons and calculate the different angles formed by each shape. They construct circles, trapezoids, and rectangles and answer 20 questions.
Worksheet
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Perimeter and Circumference

For Students 10th
In this geometry worksheet, 10th graders are given shapes of rectangles and circles. They calculate the perimeter and circumference of the different polygons given values for the diameter or sides. There are 10 questions with an answer key.
Lesson Plan
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Line Hunt

For Teachers K - 3rd
Students identify lines in everyday images.  In this art analysis lesson, students practice drawing diagonal, vertical and horizontal lines on pieces of chart paper.  Students examine a page from a magazine and identify the...
Worksheet
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Volume of Sphere

For Students 10th
In this geometry worksheet, 10th graders are given the radius and diameter of a circle and asked to find the volume of a sphere. There are 8 questions with an answer key.
Worksheet
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Arc Length Transparencies

For Students 9th - 10th
In this geometry activity, students use an arc length transparency to calculate the circumference and arc length of a circle. There are 18 questions.
Worksheet
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Area and Perimeter of Compound Shapes

For Students 7th - 9th
In this geometry worksheet, students find the area and perimeter of 6 different compound shapes containing squares, rectangles, triangles, and half circles. 
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2D and 3D Shapes

For Students 2nd - 4th
In this geometry worksheet, students draw 6 different shapes as requested by 6 specific directives in the circles provided. Students draw 2D and 3D shapes.
Lesson Plan
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Kindergarten Geometry

For Teachers K
Students choose a square of any size and use yarn to show that all 4 sides are the same. They sort the traffic sign cards into groups of squares and non-squares. Also they make a square using Q-tips; tell how you know it is a square.
Lesson Plan
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Circle the Earth - Explore Surface Types on a Journey around Earth

For Teachers 4th - 12th
Students use CERES percent coverage surface data with a world map in locating landmasses and bodies of water at Earth's Equator.
Worksheet
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Hold Everything!

For Students K - 1st
For this measurable quantities worksheet, students study the two containers in each exercise and circle the container that holds more volume. Students underline the container that holds less.
Lesson Plan
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Intersecting Lines and Segments of Measures

For Teachers 8th - 12th Standards
Mathematicians measure intersecting lines-and circles, and create chords. In this geometry lesson, students explore interrior and exterior chords created by tangent and secant lines. These segments can be inside the circleor outside the...
Lesson Plan
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Area Of Sectors

For Teachers 9th - 12th
Student find the area of a sector of a circle. In this geometry lesson, students  define the sector of a circle using a sketch. They find and identify examples of sector in the real world.
Lesson Plan
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Plain Figures and Measuring Figures

For Teachers 10th - 12th
Students investigate basic geometric concepts. In this geometry lesson, students explore solids through measuring and modeling. This assignment models the importance of understanding concrete objects in geometry.      
Lesson Plan
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The Flat Earth

For Teachers 9th - 11th
Students differentiate between different planes. In this geometry lesson plan, students differentiate between a plane and a sphere. They discuss the Great Circle, Geodesic and Lune as it relates to the earth.
Lesson Plan
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Geometric Relatioships

For Teachers 4th - 8th
Students explore measurements and geometric formulas. In this geometry lesson, students investigate pi as it relates to geometry. They collect data and use a chart to organize the data.

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