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.
Father of geometry
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"The only purpose of the 'Elements' is to demonstrate mathematically certain fundamental propositions."
Shocking"The properties of figures are derived from their definitions and postulates."
Strange & Unusual"Proof by contradiction is a powerful tool."
Shocking"A prime number is that which is measured by a unit alone."
Strange & Unusual"In any right-angled triangle, the square on the side subtending the right angle is equal to the squares on the sides containing the right angle."
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