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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Click image to the left for more content.CK-12 Foundation: Chapter4IsoscelesTrianglesA
Watch the first part of this video.
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Click image to the left for more content.James Sousa:HowTo Construct AnIsosceles Triangle
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Click image to the left for more content.James Sousa:Proof of the Isosceles TriangleTheorem
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Click image to the left for more content.James Sousa:Using the Properties ofIsosceles Trianglesto Determine Values