Angle Relationships

Front

What is the sum of all angles in a triangle?

Back

180°

Front

If two angles are complementary, what is the sum of their measures?

Back

90°

Front

If two angles are supplementary, what is the sum of their measures?

Back

180°

Front

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

Back

60°

Front

What is the measure of a right angle?

Back

90°

Front

What is the Triangle Sum Theorem?

Back

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

Front

If one angle measures 40° and another measures 50°, what is the measure of the third angle in the triangle?

Back

90°

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect, and they are always equal.

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.