4.6A Angles

Front

What are the four types of angles?

Back

Straight, Right, Acute, and Obtuse.

Front

What is the definition of a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is the definition of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is the definition of an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

What is the definition of an obtuse angle?

Back

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

Front

How can you identify the vertex of an angle?

Back

The vertex of an angle is the point where the two rays meet.

Front

What is the term for the two rays that form an angle?

Back

The two rays are called the sides of the angle.

Front

What is the relationship between a straight angle and a right angle?

Back

A straight angle is formed by two right angles (180 degrees = 90 degrees + 90 degrees).

Front

How do you classify an angle that measures 120 degrees?

Back

An angle that measures 120 degrees is classified as an obtuse angle.

Front

What is the sum of angles in a triangle?

Back

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