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# Isosceles Triangles

## Properties of triangles with two equal sides.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Isosceles Triangles

This concept will teach students the properties of isosceles triangles and how to apply them to different types of problems.
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• PLIX

## Isosceles Triangles

Isosceles Triangles Interactive
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## The Three Angle Problem

Isosceles Triangles Interactive
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## Thale's Theorem

Isosceles Triangles Interactive
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• Video

## Isosceles Triangles Principles

This video gives more detail about the mathematical principles presented in Isosceles Triangles.
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• Video

## Isosceles Triangles Examples

This video shows how to work step-by-step through one or more of the examples in Isosceles Triangles.
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## Isosceles Triangles Quiz

Ten question quiz. Students will solve for missing angles and sides of isosceles triangles using basic arithmetic and algebra. One question involves the exterior angle theorem. For one question students must draw an isosceles triangle with two given angle measurements.
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• Critical Thinking

## Isosceles Triangles Discussion Questions

A list of student-submitted discussion questions for Isosceles Triangles.
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• Real World Application

## Triangles in the Sky

Learn why isosceles triangles are incorporated into the design of stealth bomber aircraft.
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• Real World Application

## Isosceles Triangles

Make isosceles triangles using origami.
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• Study Guide