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Interactive
CK-12 Foundation

Area Between Curves: Income and Expenses

For Students 11th - Higher Ed
Use the area of polygons to calculate the area between curves. Pupils calculate areas under income and expense curves by filling the space with squares and right triangles. Using that information, they determine the profit related to the...
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Assessment
Mathed Up!

Pythagoras' Theorem

For Students 7th - 10th Standards
Use a right method to find a distance. Given a right triangle, class members find the length of one side given the measurement of the other two sides—the missing side may or may not be the hypotenuse. A video reminds the pupils how to...
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Instructional Video3:10
Corbett Maths

Hexagon Inscribed Within a Circle

For Students 8th - 12th Standards
Mark off the length of the radius around the circle. Using a compass, the presenter shows how to construct a regular hexagon in a circle. Pupils see how triangles formed in the hexagon are equilateral, allowing for the construction to...
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Assessment
Concord Consortium

Proportional Representation

For Students 9th - 12th Standards
Sometimes the solution is all a matter of perspective. The short assessment task presents a problem to pupils that requires them to make sense of a diagram. Once learners see two similar triangles, the rest of the solution is solving a...
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Lesson Plan
Curated OER

Triangle Proofs

For Teachers 10th
Tenth graders complete a unit of lessons on congruent triangles and triangle proofs. They observe and participate in teacher-led discussions of examples of the methods to prove that triangles are congruent, and create an original proof.
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Interactive
Curated OER

Identifying Triangles

For Students 10th
In this geometry learning exercise, 10th graders identify a triangle as right, acute, or obtuse and identify the parts of a right triangle in a drop and drag game format.  The one page interactive learning exercise contains eight...
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Worksheet
Curated OER

Right Triangles

For Students 10th
In this right triangles worksheet, 10th graders solve 5 problems that relate to different right triangles. First, they find the values of x and y so that each triangle is congruent to the other. Then, students write a two-column proof...
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Worksheet
Curated OER

Triangle Congruence

For Students 10th
In this triangle congruence worksheet, 10th graders solve 12 different problems that include determining triangle congruence. First, they prove that triangles are either congruent or similar. Then, students determine whether they can...
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Worksheet
Curated OER

Classifying Triangles

For Students 10th
In this classifying triangles worksheet, 10th graders solve 12 different problems that include classifying various types of triangles. They classify and then identify each of the given triangles as isosceles, scalene, or equilateral....
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Worksheet
Curated OER

Congruent Triangles

For Students 10th
In this congruent triangles worksheet, 10th graders solve and complete 10 different problems to determine whether each set of triangles is congruent or not. First, they copy each diagram onto a piece of paper and mark up the paper with...
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Worksheet
Curated OER

Mid-Segment of a Triangle

For Students 10th - 11th
In this triangle worksheet, students examine triangle diagrams. They determine the perimeter, length of a line, midpoint of a line, and angle measurement from given information. This one-page worksheet contains ten problems.
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Worksheet
Curated OER

Tracing Triangles

For Students K - 3rd
In this tracing triangles worksheet, students trace the 4 triangles in each of the 3 rows and then draw some triangles on the back of the worksheet.
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Worksheet
Curated OER

Geometry and Triangles

For Students 11th - Higher Ed
In this geometry triangles worksheet, students first determine how many degrees are found in one half and in three-fifths a revolution. Then they find the supplement of the two angles given and the radius of a circle. Students also...
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Worksheet
Curated OER

Special Right Triangles

For Students 10th
In this special right triangles worksheet, 10th graders solve 10 different problems that include solving equations that are special right triangles. First, they determine the exact value of each problem. Then, students use the...
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Worksheet
Curated OER

Congruent Triangles

For Students 10th
In this congruent triangles worksheet, 10th graders solve and complete 13 different problems. First, they use the illustrated congruent triangles to show other congruency in each problem. Then, students determine and prove the angle...
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Worksheet
Curated OER

Finding the Angle Measurements in Isosceles Triangles

For Students 9th
In this angles worksheet, 9th graders find the angle measurements in four isosceles triangles.  Two of these triangles are drawn inside a circle, where two of the sides of the triangles are formed by radii.
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Worksheet
Curated OER

Recognizing Triangles

For Students 1st - 2nd
In this triangles worksheet, students analyze 25 shapes in a full page collage. Some of the shapes have curved or jagged sides. Students circle all the triangles.
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Lesson Plan
Curated OER

Centroid of a Triangle

For Teachers 6th - 9th
Students build on existing knowledge of median and midpoints of triangles. They incorporate their prior knowledge to develop an example of the center of a mass of a triangle. They share their sketches with their classmates.
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Worksheet
Curated OER

Triangles- Lower Elementary Geometry Coloring Page

For Students 1st - 2nd
In this lower elementary geometry activity, students locate all of the triangles and color them green. They color triangles in the form of a Yield sign, a sandwich, a tent, and mask.
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Worksheet
Curated OER

Identify Similar Triangles With Proofs

For Students 10th - 12th
In this similar triangle worksheet, students write a two-column proof to explain why determined triangles are similar. Given some line lengths and angle measurements, students use proofs to identify the ratio of specified angles. This...
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Lesson Plan
Curated OER

Triangles

For Teachers 7th
In this geometry worksheet, 7th graders identify the sides and angles of triangles, examine the Pythagorean Theorem, and complete 2 tables with square numbers. They apply the theorem to find the value of the hypotenuse of 2 triangles.
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Worksheet
Curated OER

Triangles

For Students K
In this triangle worksheet, students focus on mastery of the shape. Students trace 3 large and 3 small triangles.
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Worksheet
Curated OER

Triangle Coloring Sheet

For Students Pre-K - 1st
In this shape-themed coloring worksheet, students use crayons and markers to color the word triangle as well as the picture of a triangle.
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Worksheet
Curated OER

Triangle Exercises

For Students 9th - Higher Ed
For this math worksheet, students look for the solutions to the various problems involving triangles. They focus upon finding the angles and lengths of sides.

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