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point

A dot that can be named

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Line

A line goes on forever in each direction.

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segment

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

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Ray

A line that goes on forever in one direction

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Plane

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

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opposite Rays

Rays going in opposite directions

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Angle

the space between two lines or planes that intersect

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Collinear

On the same line

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Coplanar

On the same plane

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Midpoint

The point that's directly inbetween two other points.

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Vertex

The bent point or starting point of a angle

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Complementary angles

Two angles whose sum is 90 degrees

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Supplementary

sum of angles that equals 180 degrees

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Vertical angles

Two lines that intersect and have two pairs of angles.

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Adjacent angles

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

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Linear pair

Two angles that add up to 180

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Acute angles

An angle that is less than 90 degrees

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Obtuse angle

An angle that is more then 90 degrees

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Right angle

An angle that is 90 degrees

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Straight angle

An angle that is 180 degrees

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Perpendicular

intersecting at or forming right angles

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