Trilateral figures are those contained by three straight lines, quadrilateral those contained by four, and multilateral those contained by more than four straight lines.
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"Let it be granted that a finite straight line may be produced to any length in a straight line."
"The properties of figures are derived from their definitions and postulates."
"There are infinitely many prime numbers."
"Proof by contradiction is a powerful tool."
"A straight line is a line which lies evenly with the points on itself."
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