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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"A straight line is a line which lies evenly with the points on itself."
Shocking"If two triangles have two sides equal to two sides respectively, and have the angles contained by the equal straight lines equal, they will also have the base equal to the base, the triangle will be e…"
Strange & Unusual"What has been affirmed without proof can also be denied without proof."
Strange & Unusual"The postulates are not self-evident, but they are necessary for the development of geometry."
Strange & Unusual"A ratio is a sort of relation in respect of size between two magnitudes of the same kind."
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