Geometry Vocabulary

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What is a ray?

Back

A ray is a line that starts at a point and extends infinitely in one direction.

Front

What are collinear points?

Back

Points that lie on the same straight line.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

What is a transversal?

Back

A line that intersects two or more lines at different points.