CK-12 Geometry-Concepts

4.10. Isosceles Triangles http://www.ck12.org

4.10 Isosceles Triangles

Here you’ll learn the definition of an isosceles triangle as well as two theorems about isosceles triangles.

What if you were presented with an isosceles triangle and told that its base angles measurex◦andy◦? What could
you conclude aboutxandy? After completing this Concept, you’ll be able to apply important properties about
isosceles triangles to help you solve problems like this one.

Watch This

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CK-12 Foundation: Chapter4IsoscelesTrianglesA

Watch the first part of this video.

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URL: http://www.ck12.org/flx/render/embeddedobject/1308

James Sousa: How To Construct An Isosceles Triangle

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James Sousa: Proof of the Isosceles Triangle Theorem

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URL: http://www.ck12.org/flx/render/embeddedobject/1310