5-4 Isos & Equil Triangles Hon

Front

For isosceles triangles, when we are given that two sides are congruent we can prove that ______________________.

Back

two angles are congruent.

Front

What are the different parts of an isosceles triangle?

Back

2 legs, 1 vertex angle, 1 base, and 2 base angles.

Front

If two angles of a triangle are congruent, what can be said about the sides opposite those angles?

Back

The sides opposite the congruent angles are also congruent.

Front

What is the sum of the interior angles of any triangle?

Back

180 degrees.

Front

In an isosceles triangle, what is the relationship between the base angles?

Back

The base angles are congruent.

Front

If the vertex angle of an isosceles triangle measures 40 degrees, what is the measure of each base angle?

Back

70 degrees.

Front

What is the definition of an isosceles triangle?

Back

A triangle with at least two sides that are congruent.

Front

If one angle of an isosceles triangle is 100 degrees, what is the measure of each of the base angles?

Back

40 degrees.

Front

In triangle ABC, if AB = AC, what can be concluded about angles B and C?

Back

Angles B and C are congruent.

Front

What is the formula for finding the area of a triangle?

Back

Area = 1/2 * base * height.