A pair of adjacent angles whose noncommon sides are opposite rays.
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Segment bisector
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a segment, ray, line, or plane that intersects a segment at its midpoint
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Line segment
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A part of a line with two endpoints
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perpendicular lines
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Lines that intersect to form right angles
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parallel lines
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lines in the same plane that never intersect
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Collinear
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Points that lie on the same line
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ray
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a part of a line that starts at one endpoint and extends forever
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Midpoint
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A point that divides a segment into two congruent segments
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coplanar
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points that lie on the same plane
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Congruent
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Having the same size and shape
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distance
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How far it is from one point to another
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Line
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1. A long thin mark on a surface. 2. A continuous extent of length, straight or curved, without breadth or thickness; the trace of a moving point. 3. Long, narrow mark or band.