Types of Angles

Front

What is a right angle?

Back

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

Front

What type of angle measures less than 90 degrees?

Back

An acute angle.

Front

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

Back

An obtuse angle.

Front

What is a straight angle?

Back

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

Front

If two lines intersect to form a right angle, what is the relationship between those lines?

Back

The lines are perpendicular to each other.

Front

What do you call an angle that measures exactly 90 degrees?

Back

A right angle.

Front

Which angles are formed when two lines cross each other?

Back

Vertical angles and adjacent angles.

Front

What is the sum of the angles in a triangle?

Back

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

Front

If one angle in a right triangle is 30 degrees, what is the other non-right angle?

Back

The other angle is 60 degrees.

Front

What is the term for angles that add up to 90 degrees?

Back

Complementary angles.