adding and subtracting angles

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (the vertex). It is measured in degrees (°).

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180°.

Front

What is the sum of angles in a triangle?

Back

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

Front

What is an acute angle?

Back

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

Front

What is an obtuse angle?

Back

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

Front

How do you add angles?

Back

To add angles, simply add their measures together. For example, if angle A is 30° and angle B is 60°, then A + B = 90°.

Front

How do you subtract angles?

Back

To subtract angles, subtract their measures. For example, if angle A is 90° and angle B is 30°, then A - B = 60°.

Front

What is a full rotation in degrees?

Back

A full rotation is 360°.

Front

What is the relationship between complementary angles?

Back

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