Interior and Exterior Angles of Triangles

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of a triangle is always 180°.

Front

What is the measure of angle b if the other two angles are 90° and 54°?

Back

Angle b = 36°.

Front

If one angle of a triangle is 80° and another is 55°, what is the measure of the third angle?

Back

The third angle is 45°.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of the triangle and the extension of an adjacent side.

Front

How do you calculate the measure of an exterior angle?

Back

The measure of an exterior angle is equal to the sum of the two non-adjacent interior angles.

Front

If two angles of a triangle are 70° and 40°, what is the measure of the third angle?

Back

The third angle is 70°.

Front

What is the relationship between interior and exterior angles?

Back

Each exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

If the angles of a triangle are represented as x, y, and z, what equation represents the Triangle Sum Theorem?

Back

x + y + z = 180°.

Front

What is the measure of the missing angle if two angles are 25° and 50°?

Back

The missing angle is 105°.

Front

In a triangle, if one angle is 60° and another is 60°, what is the measure of the third angle?

Back

The third angle is 60°.