The diameter of a circle is the length of any line segment drawn through the center of the circle and having endpoints on the line that defines the circumference of the circle. It can also be defined as twice the radius of the circle, with a radius being a line segment with an endpoint at the center of the circle and one on the circumference of the circle.
Diameter is a length measurement
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The diameter by definition because a diameter of a given object is twice its radius.
Pie is the ratio of circuference to the diameter of the circle
Yes. That's its definition.
the ratio of the mean diameter of the body of a rocket or missile to its length
You need the formula circumference = pi x diameter pi = 3.14.. This is by the way the definition of the special number pi.