The diameter is the same regardless of the measurement scale used. The diameter is the largest dimension across a circle passing through the center.
Also, the diameter is twice the radius. Where the radius is the measurement from the center to the outer edge.
Given that the circumference of a circle is found as: C = 2 * pi * r
It can be found that the diameter is: D = C / pi
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The circumference of a circle with a diameter of 45 inches is 141.37 inches.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
The area of a circle with a diameter of 16 inches is: 201.1 square inches.
The area of a circle that has a diameter of 14 inches is: 153.9 square inches.
The area of a circle with a diameter of 75 inches is: 4,418 square inches.