Points, Lines, Line Segments, Rays, and Angles

Front

What is a point?

Back

A point is a specific location in space that has no size or dimension.

Front

What is a line?

Back

A straight set of points that goes 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 starts at one point and goes on forever in one direction.

Front

What is an angle?

Back

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

Front

What is an acute angle?

Back

An angle that is less than 90 degrees.

Front

What is a right angle?

Back

An angle that is exactly 90 degrees.

Front

What is an obtuse angle?

Back

An angle that is greater than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that is exactly 180 degrees.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.