Texas Instruments
Construction Regular Polygons
Learners investigate the process necessary to construct regular polygons. They explore the degree measures of the angles in a regular polygon. Using this information and technology in the form of Cabri Jr., your pupils will construct...
Curated OER
Balancing Act
Second graders identify the attributes of various shapes and estimate the weight of the objects. In this geometry activity, 2nd graders identify the attributes of concrete objects and use a pan balance to weight them.
Curated OER
Power Question 2
In this math worksheet, students determine the locus of points, M, in plane ABC, such that KMAB=KMAC. They also draw the triangle ABC. Then determine the proof of the interior angles determining the identity of the equilateral triangle.
Curated OER
Identifying Types of Triangles
In this triangle worksheet, students check the appropriate label for triangles: right, acute, obtuse, scalene, isosceles or equilateral. A reference web site is given for additional activities.
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Properties of Fractals
Students build a working definition of a regular fractal, they measure the concepts of dimensions and scale, they explore the concept of a logarithm and they attempt to solve simple exponential equations for the exponent both by trial...
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Vocab-u-lous! Build a Fabulous Vocab
In this vocabulary activity, students determine the best choice from the word bank to complete the sentence. The challenging words all begin with the letter "H."
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"The Greedy Triangle" by Marilyn Burns
Students review angles, sides, and properties of basic shapes. Using a geoboard, they make as many different tirangles as possible.
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Patterns and Linear Functions
Students investigate the concept of a linear function. They use geoboards to find the interior angle sums. The sum of the angles is found to equal 180 degrees. Students also investigate quadrilaterals.
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Algebra/Geometry Institute: Area of Polygons
Students find the area of polygons. In this area of polygons lesson, students find the area of parallelograms, rectangles, squares, and other polygons. They identify each given figure and determine the appropriate formula...
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CSI Investigation of Congruence and Similarity
Students differentiate between similarity and congruence using polygons. In this geometry lesson, students label triangles based on their properties. They find missing sides and angles using the interior sum theorem.
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Polygons and Diagonals
Students practice measuring the interior angles of given regular polygons and create a formula for finding the measure of th interior angles of any polygon. They determine the relationships between the number of vertices's or sides in a...
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What a Shape!
Second graders culminate their study of shapes by describing the shapes using the proper mathematical descriptors.
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Circles, Rectangles, Squares, Triangles
Students identify, compare and classify the various shapes. In this shapes lesson, students listen to descriptions of shapes with words such as sides, angles, congruent, and parallel. Students then give the teacher examples of shapes...
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Classifying Triangles
In this classifying triangles activity, 10th graders solve and complete 11 different types of problems. First, they state whether each segment shown is an altitude, median, or neither. Then, students solve for x and find the requested...
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The Shape of Things
Students create shape booklets. In this interdisciplinary activity, students practice shape recognition as they participate in a scavenger hunt and create a shape booklet.
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Geo Jammin' - Day 2, Lesson 4: Sing a Song of Shapes
Students learn five songs to define and develop understanding of the attributes of two- and three-dimensional figures and the meaning of mathematical terms. They classify objects as either two- or three-dimensional, through the use of...
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Seven Sets of Area Problems
For this area worksheet, students solve for the area of rectangles, parallelograms, triangles, trapezoids, kites, regular polygons, circles, and surface area. The worksheets is divided into seven different sets of problems.
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Symmetry and Tessellations
Sixth graders investigate tessellations and their origins. Students trace triangles to form a tessellation. They measure the angle of equilateral triangles. Students locate the line of symmetry, they create geometric squares,...
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The Librarian Who Measured the Circumference of the Earth
Sixth graders explore angles, triangles, and investigate the circumference of the earth. They participate in a Webquest, access data bases, and communicate with other students through an on-line project site involving the circumference...
Curated OER
Displacement Problem Set
Students calculate the length of a side of a triangle using a trigonometric function. They calculate the measure of an angle given two sides of a triangle with a trigonometric function.
Exploratorium
Rotating String Shapes
Here is a very interesting way of studying triangles and polygons. Pupils work together and use pieces of string to create a variety of shapes. Depending on how many kids are manipulating the string at any one time, the number of...
Curated OER
T Points from Directions
Here is a lesson that starts with having geometers translate points using compass directions into an accurate picture of the problem. Then they must use their knowledge of the Pythagorean theorem or similar triangles to solve. This makes...
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Pythagorean Theorem
Students explore the history of Pythagoras and his contributions to mathematics. For this middle school geometry lesson, students use one inch tiles to investigate the Pythagorean Theorem and to find the length of the sides of a right...
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Distance Formula
Learners create ways to find the number of square miles that lie in a triangle having vertices at A, B, and C. They compute the distance between two points and use Heron's formula to find the area of the triangle. Finally, students...