Types of Angles and Lines

Front

What type of angle is less than 90 degrees?

Back

Acute angle

Front

What is the term for a part of a line that has two endpoints?

Back

Line segment

Front

What type of angle is exactly 90 degrees?

Back

Right angle

Front

What type of angle is more than 90 degrees but less than 180 degrees?

Back

Obtuse angle

Front

What do you call an angle that is exactly 180 degrees?

Back

Straight angle

Front

What is a ray?

Back

A part of a line that has one endpoint and goes on endlessly in one direction.

Front

Which two line segments create a right angle?

Back

Line segments that meet at a 90-degree angle.

Front

What is the sum of angles in a triangle?

Back

180 degrees

Front

What is a vertical angle?

Back

Angles that are opposite each other when two lines intersect.

Front

What is a complementary angle?

Back

Two angles that add up to 90 degrees.