Geometry Basics

Front

What is a straight angle?

Back

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

Front

What do two letters on a line represent?

Back

They represent points on the line.

Front

What are parallel lines?

Back

Parallel lines are lines that never touch or intersect, no matter how far they are extended.

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 an acute angle?

Back

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

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is the difference between a ray and a line segment?

Back

A ray has one endpoint and extends infinitely in one direction, while a line segment has two endpoints.

Front

What is a polygon?

Back

A polygon is a closed figure made up of straight line segments.

Front

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

Back

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