Triangle Sum Theorem

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 degrees.

Front

If one angle of a triangle is 50° and another is 60°, what is the measure of the third angle?

Back

70°

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

If two angles of a triangle are 45° and 55°, what is the value of x in the equation x + 45 + 55 = 180?

Back

x = 80°.

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 angle A = 30° and angle B = 60°, what is angle C?

Back

Angle C = 90°.

Front

What is the measure of the angles in a triangle if one angle is twice the second angle and the third angle is 20°?

Back

The angles are 40°, 80°, and 20°.

Front

In a triangle, if one angle measures 150°, what can you say about the other two angles?

Back

The other two angles must be acute and their sum must be 30°.

Front

What is the sum of the angles in a triangle?

Back

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