Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has two of its sides alone equal, and a scalene triangle that which has its three sides unequal.
Father of geometry
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Cross Reference
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"If equals be added to equals, the wholes are equal."
Strange & Unusual"That all right angles are equal to one another."
Shocking"Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction."
Strange & Unusual"A ratio is a sort of relation in respect of size between two magnitudes of the same kind."
Strange & Unusual"When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular …"
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