Naming in Geometry

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

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

Front

What is a right angle?

Back

A right angle is 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 ray?

Back

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

Front

What are opposite rays?

Back

Opposite rays are two rays that share a common endpoint and extend in opposite directions.

Front

What is a line?

Back

A line is a straight path that extends infinitely in both directions with no endpoints.

Front

How do you name an angle?

Back

An angle can be named using three points, with the vertex point in the middle (e.g., Angle ABC).

Front

What is the vertex of an angle?

Back

The vertex of an angle is the point where the two rays meet.