Angle Relationships

Front

What is an adjacent angle?

Back

Adjacent angles are two angles that share a common side and a common vertex, but do not overlap.

Front

What is a vertical angle?

Back

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

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

If one angle measures 30 degrees, what is the measure of its complementary angle?

Back

The complementary angle measures 60 degrees, since 90 - 30 = 60.

Front

If one angle measures 120 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle measures 60 degrees, since 180 - 120 = 60.

Front

What is the sum of the measures of two adjacent angles?

Back

The sum of the measures of two adjacent angles can be any value, but if they are supplementary, it is 180 degrees.

Front

If two angles are vertical, what can we say about their measures?

Back

If two angles are vertical, their measures are equal.

Front

What is the relationship between complementary angles?

Back

The relationship is that the sum of their measures is always 90 degrees.

Front

What is the relationship between supplementary angles?

Back

The relationship is that the sum of their measures is always 180 degrees.