Triangle Sum Theorem

Front

What does the Triangle Sum Theorem state?

Back

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

Front

If one angle of a triangle is 60° and another is 70°, what is the measure of the third angle?

Back

The third angle is 50° (180° - 60° - 70° = 50°).

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 an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Front

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

Back

The sum of the interior angles of a triangle is 180°.

Front

If two angles of a triangle are 45° and 45°, what is the measure of the third angle?

Back

The third angle is 90° (180° - 45° - 45° = 90°).

Front

What is the relationship between the angles in a right triangle?

Back

In a right triangle, one angle is 90°, and the sum of the other two angles is 90°.

Front

If a triangle has angles measuring 30° and 60°, what is the measure of the third angle?

Back

The third angle is 90° (180° - 30° - 60° = 90°).

Front

What is the measure of an angle that is supplementary to a 120° angle?

Back

The supplementary angle is 60° (180° - 120° = 60°).

Front

What is the measure of an angle that is complementary to a 30° angle?

Back

The complementary angle is 60° (90° - 30° = 60°).