Euclid — "To construct an equilateral triangle on a given finite straight line."
To construct an equilateral triangle on a given finite straight line.
To construct an equilateral triangle on a given finite straight line.
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"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 thr…"
"A ratio is a sort of relation in respect of size between two magnitudes of the same kind."
"If four magnitudes be proportional, the rectangle contained by the extremes is equal to the rectangle contained by the means."
"If a straight line be cut in extreme and mean ratio, the greater segment is also cut in extreme and mean ratio by the lesser segment."
"The extremities of a line are points."
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