Angle Pair Relationships & Triangles

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

How do you find the measure of an angle when given its complementary angle?

Back

To find the measure of an angle when given its complementary angle, subtract the measure of the known angle from 90 degrees.

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is an angle pair relationship?

Back

An angle pair relationship describes how two angles relate to each other, such as complementary, supplementary, or vertical.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

If one angle measures 45 degrees, what is its complementary angle?

Back

The complementary angle would measure 45 degrees, since 90 - 45 = 45.

Front

If two angles are vertical, what can be said about their measures?

Back

If two angles are vertical, their measures are equal.

Front

How do you determine if two angles are complementary?

Back

To determine if two angles are complementary, add their measures together. If the sum is 90 degrees, they are complementary.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are also equal.