Euclid — "Things which are equal to the same thing are also equal to one another."
Things which are equal to the same thing are also equal to one another.
Things which are equal to the same thing are also equal to one another.
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"A quantity is said to be a part of a quantity, the less of the greater, when it measures the greater."
"A straight line is that which lies evenly between its extreme points."
"To cut off from the greater of two given unequal straight lines a straight line equal to the less."
"If a straight line be drawn from the ends of a straight line, it will be a triangle."
"Rectilinear figures are those which are contained by straight lines, trilateral figures being those contained by three, quadrilateral those contained by four, and multilateral those contained by more …"
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