The diameter is a straight line going from a point on the circumference of a circle, through the centre of the circle, to another point on the circumference. It can be of any length.
A metre is a standard unit for measuring length.
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Twice as much as the radius
3 * pi meters
The diameter of a bacterial spiral is 1.5 x 10-5meters.
The area is 28.274 square meters.
Outer radius minus inner radius Subtract the inside diameter from the outside diameter, then divide the difference by 2.