Angles

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint called the vertex.

Front

What are the two rays in an angle called?

Back

The two rays in an angle are called the sides of the angle.

Front

What type of angle is less than 90 degrees?

Back

An acute angle.

Front

What type of angle is exactly 90 degrees?

Back

A right angle.

Front

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

Back

An obtuse angle.

Front

What type of angle is exactly 180 degrees?

Back

A straight angle.

Front

What is a polygon?

Back

A polygon is a plane figure with at least three straight sides and angles.

Front

How many sides does a triangle have?

Back

A triangle has three sides.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is 180 degrees.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one right angle.