Geometry Vocabulary

Front

What is the point where two rays meet to form an angle?

Back

Vertex

Front

What do you call an angle that measures less than 90 degrees?

Back

Acute angle

Front

What are lines that intersect at right angles to form a right angle called?

Back

Perpendicular lines

Front

How many degrees is a straight angle?

Back

180 degrees

Front

What is the part of a line between two points on the line called?

Back

Line segment

Front

What do you call a line that extends infinitely in both directions?

Back

Line

Front

What is a ray?

Back

A part of a line that has one endpoint and extends infinitely in one direction.

Front

What is the term for lines that never intersect?

Back

Parallel lines

Front

What is an angle that measures exactly 90 degrees called?

Back

Right angle

Front

What do you call an angle that measures more than 90 degrees but less than 180 degrees?

Back

Obtuse angle