Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has only two of its sides equal, and a scalene triangle that which has its three sides unequal.
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"For the things of the world cannot be made manifest without the knowledge of mathematics."
"If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the …"
"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."
"To construct a square on a given straight line."
"The prime numbers are more than any assigned multitude of prime numbers."
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