Isosceles and Equilateral Triangles

Front

What is an isosceles triangle?

Back

A triangle with at least two equal sides and two equal angles.

Front

What is an equilateral triangle?

Back

A triangle with all three sides equal and all three angles measuring 60°.

Front

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

Back

180°.

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

If two angles are equal in an isosceles triangle, what can be said about the sides opposite those angles?

Back

The sides opposite the equal angles are also equal.

Front

What is the measure of each angle in an equilateral triangle?

Back

60°.

Front

In a right triangle, what is the measure of one of the angles?

Back

90°.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

If one angle of a triangle measures 90°, what type of triangle is it?

Back

It is a right triangle.