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.
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"If a number be the least that is measured by any prime numbers, it will not be measured by any other prime number except those originally measuring it."
"Give him threepence, since he must make a gain out of what he learns."
"A prime number is that which is measured by a unit alone."
"The greatest of the parts is called the antecedent, and the less the consequent."
"Let it be granted that a finite straight line may be produced to any length in a straight line."
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