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a geometric drawing that uses a limited set of tools (compass and straight edge)


extends in one dimension (has lenght); usually represented by a line with arrows at each end; always straight

linear pair

two adjacent angles whose noncommon sides are opposite rays

vertical angles

A pair of opposite congruent angles formed by intersecting lines., two angles whose sides form two pairs of opposite rays


something accepted as true without proof; an axiom

straight angles

measures exactly 180 degrees and forms a straight line

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