4.6 Isosceles Triangles. Objectives. Use properties of isosceles triangles Use properties of equilateral triangles. Properties of Isosceles Triangles. The formed by the ≅ sides is called the vertex angle . The two ≅ sides are called legs . The third side is called the base .
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If two s of a ∆ are ≅, then the sides opposite those s are ≅ (if B ≅ C, then AC ≅ AB).
a. Name two congruent angles.
b. Name two congruent segments.