Euclid — "Similar triangles are to one another in the duplicate ratio of their correspondi…"
Similar triangles are to one another in the duplicate ratio of their corresponding sides.
Similar triangles are to one another in the duplicate ratio of their corresponding sides.
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"To construct a regular pentagon in a given circle."
"A semicircle is the figure contained by the diameter and the circumference cut off by it. And the center of the semicircle is the same as that of the circle."
"Let the following be postulated:"
"A quantity is said to be a part of a quantity, the less of the greater, when it measures the greater."
"Let it be granted that a circle may be described with any center and any radius."
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