# Background information on isosceles triangles

A second alternate proof builds on Ravi's picture. Congruent angles in isosceles triangles.

Student View. IM Commentary The goal of this task is to establish that base angles in an isosceles triangle are congruent.

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There are also many possible approaches to this task in the classroom: For a more directed approach, the teacher may wish to suggest one method or perhaps give different ideas to different groups of students. Students might be prompted without guidance to prove that base angles in an isosceles triangle are congruent. As they progress, the teacher can share some of the approaches given here. Students might discuss the relative merits of the different arguments.

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## Types of Triangles

Definition of isosceles triangle. Learn More about isosceles triangle. Share isosceles triangle Post the Definition of isosceles triangle to Facebook Share the Definition of isosceles triangle on Twitter. Resources for isosceles triangle Time Traveler: Explore other words from the year isosceles triangle first appeared Time Traveler!

## isosceles triangle

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Properties of Isosceles Triangles (Proof) - Geometry

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