Measuring Angles

Front

What is an angle?

Back

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

Front

What unit is used to measure angles?

Back

Angles are measured in degrees (°).

Tags

CCSS.4.MD.C.6

Front

What is a right angle?

Back

A right angle measures exactly 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

An acute angle measures less than 90 degrees.

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a straight angle?

Back

A straight angle measures exactly 180 degrees.

Tags

CCSS.4.G.A.1

Front

What is a full angle?

Back

A full angle measures exactly 360 degrees.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Front

How do you measure an angle using a protractor?

Back

Align the protractor's center point with the angle's vertex and read the measurement where one ray crosses the protractor's scale.

Tags

CCSS.4.MD.C.6

Front

What is the sum of angles in a triangle?

Back

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

Tags

CCSS.8.G.A.5

Front

What is a complementary angle?

Back

Two angles are complementary if their measures add up to 90 degrees.

Tags

CCSS.7.G.B.5