Sum of Interior Angles of a Triangle

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 is 90° and another is 50°, what is the measure of the third angle?

Back

The third angle measures 40° (180° - 90° - 50° = 40°).

Front

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

Back

In an equilateral triangle, each angle measures 60°.

Front

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

Back

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

Front

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

Back

The third angle measures 70° (180° - 70° - 40° = 70°).

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

In a triangle, if one angle is 130°, what is the maximum possible measure of the other two angles?

Back

The maximum possible measure of the other two angles is 50° each (130° + 50° + 50° = 180°).

Front

What is the measure of the missing angle if two angles are 30° and 50°?

Back

The missing angle measures 100° (180° - 30° - 50° = 100°).

Front

If a triangle has angles measuring 80° and 60°, what is the measure of the third angle?

Back

The third angle measures 40° (180° - 80° - 60° = 40°).

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°.