Euclid — "Parallelograms which are on the same base and in the same parallels are equal to…"
Parallelograms which are on the same base and in the same parallels are equal to one another.
Parallelograms which are on the same base and in the same parallels are equal to one another.
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"In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to one another."
"Similar triangles are to one another in the duplicate ratio of their corresponding sides."
"A number is a multitude composed of units."
"To construct a square on a given straight line."
"For the things of the world cannot be made manifest without the knowledge of mathematics."
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