Protractors & Angles

Front

What is a protractor?

Back

A protractor is a tool used to measure angles in degrees.

Tags

CCSS.4.MD.C.6

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint, called the vertex.

Front

What is the measurement of a straight angle?

Back

A straight angle measures 180 degrees.

Tags

CCSS.4.G.A.1

Front

What is an acute angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

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

Tags

CCSS.4.G.A.1

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Tags

CCSS.4.G.A.1

Front

How do you measure an angle using a protractor?

Back

To measure an angle, align the protractor's center point with the vertex of the angle and read the measurement where one ray crosses the protractor.

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

If angle A measures 30 degrees, what is the measure of its complement?

Back

The complement of angle A is 60 degrees (90 - 30 = 60).

Tags

CCSS.7.G.B.5

Front

If angle B measures 110 degrees, what is the measure of its supplement?

Back

The supplement of angle B is 70 degrees (180 - 110 = 70).

Tags

CCSS.7.G.B.5