4.7C (Readiness) - 4th Grade Math STAAR Review

Front

What is an angle?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180 degrees.

Front

What is a protractor used for?

Back

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

Front

How do you find the measure of an angle using a protractor?

Back

Align the protractor's center point with the angle's vertex, then read the degree measurement where one ray intersects the protractor.

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 reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Front

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

Back

The complement of angle A is 60 degrees, because 90 - 30 = 60.

Front

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

Back

The supplement of angle B is 70 degrees, because 180 - 110 = 70.