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.
Father of geometry
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"And the point is called the center of the circle."
Strange & Unusual"The extremities of a surface are lines."
Strange & Unusual"Further, of trilateral figures, a right-angled triangle is that which has a right angle, an obtuse-angled triangle that which has an obtuse angle, and an acute-angled triangle that which has its three…"
Strange & Unusual"If a straight line be drawn from the ends of a straight line, it will be a triangle."
Strange & Unusual"The only purpose of the 'Elements' is to demonstrate mathematically certain fundamental propositions."
Shocking