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

If one angle of a triangle measures 70°, what is the sum of the other two angles?

Back

The sum of the other two angles is 110°.

Front

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

Back

Each angle in an equilateral triangle measures 60°.

Front

How do you find the measure of a missing angle in a triangle?

Back

To find the measure of a missing angle, subtract the sum of the known angles from 180°.

Front

What is the relationship between exterior angles and interior angles of a triangle?

Back

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

Front

If one angle of a triangle is 120°, what is the maximum possible measure of the other two angles?

Back

The maximum possible measure of the other two angles is 30° each.

Front

What is the measure of an exterior angle if the two remote interior angles are 45° and 55°?

Back

The measure of the exterior angle is 100°.

Front

In a triangle, if two angles are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the measure of the third angle in a triangle if the other two angles are 38° and 104°?

Back

The measure of the third angle is 38°.

Front

How do you calculate the measure of an angle when given the measures of the other two angles?

Back

Subtract the sum of the two known angles from 180°.