Angles and Angle Measurements

Front

What is an angle?

Back

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

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle 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

How many degrees are in a full circle?

Back

There are 360 degrees in a full circle.

Front

If you divide a circle into 4 equal angles, what is the measurement of each angle?

Back

Each angle measures 90 degrees.

Front

What do you call two angles that add up to 90 degrees?

Back

Complementary angles.

Front

What do you call two angles that add up to 180 degrees?

Back

Supplementary angles.

Front

If angle ADC measures 87° and angle ADB measures 59°, what is the measure of angle BDC?

Back

28 degrees.