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XV. A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference are equal to one another. XVL And this point is called the centre...
The school Euclid: comprising the first four books, by A.K. Isbister - Σελίδα 2
των Euclides - 1863
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