Triangle Angle-sum and Exterior Angle Theorem Practice

Front

What is the Triangle Angle-Sum Theorem?

Back

The Triangle Angle-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 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

What is the measure of the third angle in a triangle if the other two angles are 50 degrees and 80 degrees?

Back

The third angle measures 50 degrees (180 - 50 - 80 = 50).

Front

What is the Exterior Angle Theorem?

Back

The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two opposite interior angles.

Front

If one angle of a triangle is 70 degrees and the other is 40 degrees, what is the measure of the third angle?

Back

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

Front

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

Back

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

Front

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

Back

To find an unknown angle, subtract the sum of the known angles from 180 degrees.

Front

What is the measure of an angle if it is supplementary to a 130-degree angle?

Back

The angle measures 50 degrees (180 - 130 = 50).

Front

What is the measure of an angle if it is complementary to a 40-degree angle?

Back

The angle measures 50 degrees (90 - 40 = 50).

Front

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

Back

It is an isosceles triangle.