Circumference = 2*pi*r
r = diameter/2
20/2 = 10
------------------so,
2*pi(10)
= 63
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circumference of a semicircle = pi * diameter / 2 (pi multiplied by the diameter and divided by 2)
10
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).
If you are given the diameter 'D' of the circle: the full circumference is (pi times D) the perimeter of the semicircle is half this plus the diameter Therefore: Pi x D /2 + D