Basic Geometry

Front

What is an angle?

Back

Two rays with the same end point, forming a vertex.

Front

What type of angle is less than 90 degrees?

Back

Acute angle.

Front

What type of angle is exactly 90 degrees?

Back

Right angle.

Front

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

Back

Obtuse angle.

Front

What is a straight angle?

Back

An angle that measures 180 degrees.

Front

What is a line?

Back

A straight set of points that go on forever in both directions.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a ray?

Back

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

Front

What is a vertex?

Back

The point where two rays meet to form an angle.

Front

What is the sum of angles in a triangle?

Back

180 degrees.