Basic Geometry terms

Front

An angle that measures more than 180 degrees is called an __________ angle.

Back

Obtuse

Front

Two lines that intersect to form a right angle are called _______________ lines.

Back

Perpendicular lines

Front

An undefined term in Geometry. A flat surface that has no thickness and extends forever in all directions.

Back

Plane

Front

What do you call a portion of a line that starts at one point and extends infinitely in one direction?

Back

Ray

Front

A part of a line that has two endpoints is called a _____________.

Back

Line Segment

Front

An angle that measures exactly 90 degrees is called a __________ angle.

Back

Right angle

Front

Two lines that never intersect and are always the same distance apart are called __________ lines.

Back

Parallel lines

Front

A straight line that extends infinitely in both directions is called a __________.

Back

Line

Front

The point where two lines intersect is called a __________.

Back

Vertex

Front

An angle that measures less than 90 degrees is called an __________ angle.

Back

Acute