http://www.ck12.org Chapter 4. Triangles and Congruence
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 isoceles 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 isoceles
triangles to help you solve problems like this one.
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CK-12 Foundation: Chapter4IsoscelesTrianglesA
Watch the first part of this video.
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James Sousa:HowTo Construct AnIsosceles Triangle
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James Sousa:Proof of the Isosceles TriangleTheorem
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James Sousa:Using the Properties ofIsosceles Trianglesto Determine Values