Euclid — "A line is breadthless length."
A line is breadthless length.
A line is breadthless length.
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"In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles."
"If four magnitudes be proportional, the rectangle contained by the extremes is equal to the rectangle contained by the means."
"Things which coincide with one another are equal to one another."
"Proof by contradiction is a powerful tool."
"A quantity is said to be a part of a quantity, the less of the greater, when it measures the greater."
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