Page 1: Introduction to Isosceles and Equilateral Triangles
This page introduces the key concepts of isosceles and equilateral triangles, focusing on their properties and how to solve missing angle or side problems.
Definition: An isosceles triangle has two congruent sides called legs, a vertex angle where these sides meet, a base opposite the vertex angle, and two base angles.
Highlight: The Isosceles Triangle Theorem states that if two sides of a triangle are congruent, then the angles opposite those sides are congruent.
The page also covers the Converse of the Isosceles Triangle Theorem and introduces equilateral triangles.
Example: In an equilateral triangle, all sides are equal in length, and all angles measure 60°.
Students are given practice problems to apply these concepts, including finding missing angles and side lengths in various triangle configurations.