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1

## Adjacent Angle

Two angles that share a vertex and share a common side that separates them.

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## Vertical Angle

When two lines intersect to form four angles...the angles on opposite sides are vertical angles

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## Complimentary angles

Any two angles that add up to 90 degrees

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## Supplementary angles

When two angles add up to 180 degrees

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## Angle Bisector

A ray that divides an angle into two angles of equal degree measure

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## Right angle

An angle whose measure is 90 degrees

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## Acute angle

an angle whose degree of measuer is greater than 0 degrees and less than 90 degrees

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## Obtuse angle

an angle whose measure is greater than 90 degrees but less than 180 degrees

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## straight angle

an angle whose measure is 180 degrees

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## reflex angle

is formed by a pair of rays, one has remained stationary and the other has rotated through an angle of greater than 180 degrees but still less than 360 degrees

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