Rectilinear figures are those which are contained by straight lines, trilateral figures being those contained by three, quadrilateral those contained by four, and multilateral those contained by more than four straight lines.
Father of geometry
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Cross Reference
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"A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line."
Strange & Unusual"Similar triangles are to one another in the duplicate ratio of their corresponding sides."
Strange & Unusual"What do I gain by learning these things?"
Strange & Unusual"A plane angle is the inclination of the lines to one another, when two lines meet one another, but are not in the same straight line."
Shocking"A line is breadthless length."
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