Wk#13-Measuring Angles

Front

What is a ray?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What is the measure of a right angle?

Back

90 degrees.

Front

What is a protractor used for?

Back

A protractor is a tool used to measure angles.

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 sum of angles in a triangle?

Back

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

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 straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

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

Back

The complement of a 30-degree angle is 60 degrees.

Front

If one angle measures 120 degrees, what is the measure of its supplement?

Back

The supplement of a 120-degree angle is 60 degrees.