3.2 Angle Measures

Front

What is the definition of an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What is the measure of a right angle?

Back

A right angle measures 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 acute angle?

Back

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

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

If angle A measures 45 degrees, what is the measure of its complement?

Back

The complement of angle A is 45 degrees (90 - 45 = 45 degrees).

Front

If angle B measures 135 degrees, what is the measure of its supplement?

Back

The supplement of angle B is 45 degrees (180 - 135 = 45 degrees).

Front

What is the relationship between vertical angles?

Back

Vertical angles are equal; when two lines intersect, the opposite angles formed are equal.

Front

If angle P measures 60 degrees, what is the measure of angle Q if they are complementary?

Back

Angle Q measures 30 degrees (90 - 60 = 30 degrees).