twice the radius, the diameter is a segment that starts on any point of the circle, passes through the center of the circle, and ends on the opposite side, exactly on the circle
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Pie is the ratio of circuference to the diameter of the circle
Yes. That's its definition.
By definition the radius of a circle is a straight line drawn from the centre of a circle to its circumference. If you extend that line to the opposite side of the circle it becomes the diameter. The length of the diameter is twice the length of the radius. If the radius is 1316 the diameter is 2632
By definition, yes! Geometrically speaking, a diameter is a chord which passes through the center of the circle. Also, it is 2x the radius of the circle. Since the radius remains constant for a given circle, so is the diameter.
The cord of a circle that contains the center of that circle is a diameter of that circle.