A diameter of the circle is any straight line drawn through the center and terminated in both directions by the circumference of the circle, and such a straight line also bisects the circle.
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"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."
"No trace of Euclid's personality has survived."
"The prime numbers are more than any assigned multitude of prime numbers."
"A straight line is that which lies evenly between its extreme points."
"The extremities of a line are points."
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