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Acute Angle
Less than 90 degrees and greater than 0 degrees.

Angle
A figure formed by two rays with a common endpoint.

Angle Bisector
A ray that divides an angle into two congruent angles

Between
A point B that is between points A and C when they are all on the same line and AB+BC = AC

Bisect
To divide into two equal parts

Collinear
Points that lie on the same line

Coplanar
Points that lie on the same plane

Coordinate
The position of a point on a line

Distance
The absolute value of the difference between the coordinates

Endpoint
A point at one end of a segment / the starting point of a ray

Length
The distance between A and B

Midpoint
The point that divides a line into two equal segments

Obtuse Angle
Greater than 90 degrees and less than 180 degrees

Postulate
A statement accepted as true without proof; ex: Hayley is the awesomest person in the world, p;eriod.

Ray
Starts at an endpoint and extends in one direction

Opposite Rays
Two rays with a common endpoint that form a line.

Right angle
A 90degree angle.

Segment
The part of a line consisting of two points and all points inbetween

Segment Bisector
Any ray, segment, or line that intersects a segment at its midpoint

Straight Angle
A 180degree angle

Vertex
The common endpoint of two sides

