The diameter of a circle is twice length of a radius, because it is basically two radii (plural of radius) joined together so they form a continuous line across the circle. If you multiply the length of the radius, 40 meters, by 2, then you get the length of the diameter, 80 meters.
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22 ft. The diameter is the measurement of a circle through the center from side to side and is equal to two times the radius.
The diameter is twice the radius in inches: 18*36 = 648 inches
Assuming daimeter = diameter and raduis = radius, 1 diameter = 2*radius.
The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi
diameter is 3 ft diameter = 2*radius diameter/2 = radius 3/2 = 1.5 ft = radius area is pi * radius2 3.14 * (1.5)2 3.14 * 2.25 = 7.065 sq ft