How can we help?

You can also find more resources in our Help Center.

point

A dot that can be named

Line

A line goes on forever in each direction.

segment

A line that does not go on forever in either direction.

Ray

A line that goes on forever in one direction

Plane

A space that goes on forever that is named by a letter.

opposite Rays

Rays going in opposite directions

Space

A open area

Angle

the space between two lines or planes that intersect

Collinear

On the same line

Coplanar

On the same plane

Midpoint

The point that's directly inbetween two other points.

Bisect

To cut in two

Congruent

The same size

Vertex

The bent point or starting point of a angle

Complementary angles

Two angles whose sum is 90 degrees

Supplementary

sum of angles that equals 180 degrees

Vertical angles

Two lines that intersect and have two pairs of angles.

Adjacent angles

Angles that are right next to each other and add up too 180 degrees.

Linear pair

Two angles that add up to 180

Acute angles

An angle that is less than 90 degrees

Obtuse angle

An angle that is more then 90 degrees

Right angle

An angle that is 90 degrees

Straight angle

An angle that is 180 degrees

Perpendicular

intersecting at or forming right angles