Further, of trilateral figures, a right-angled triangle is that which has a right angle, an obtuse-angled triangle that which has an obtuse angle, and an acute-angled triangle that which has its three angles acute.
Father of geometry
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"The postulates are not self-evident, but they are necessary for the development of geometry."
Strange & Unusual"Trilateral figures are those contained by three straight lines, quadrilateral those contained by four, and multilateral those contained by more than four straight lines."
Shocking"To construct a square on a given straight line."
Strange & Unusual"The laws of nature are but the mathematical thoughts of God."
Strange & Unusual"The angles in the same segment are equal to one another."
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