# Triangles Sides and Angles

Learners explore the concept of triangles. In this triangles lesson, students prove and apply the Isosceles Triangle Theorem using Cabri Jr. on the graphing calculator. Learners construct triangles and measure the angles. Students drag the points of the triangle to notice the relationship in angle measure. Learners construct an isosceles triangle and develop the idea that isosceles triangles have two equal sides and two congruent angles.

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