###
segment

a part of a line consisting of two points and all points in between them

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endpoint

a point at one end of a segment or the starting point of a ray.

###
ray

a part of a line that starts at an endpoint and extends forever in one direction

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opposite rays

two rays that have a common endpoint and form a line

###
postulate

or axiom; a statement that is accepted without proof.

###
coordinate

a point that corresponds to one and only one number on the ruler

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distance

the absolute value of the difference of the coordinates

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length

distance between A and B

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congruent statements

segments that have the same length

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construction

a way of creating a figure that is more precise

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midpoint

the point that bisects the segment into two congruent statements

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segment bisector

any ray, segment, or line that intersects a segment at its midpoint

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angle

a figure formed by two rays, or sides, with a common endpoint called the vertex

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interior of an angle

the set of all points between the sides of the angle

###
exterior of an angle

the set of all points outside the angle

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