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A circle with a radius of 5 feet has a circumference of 31.4 feet.
The circumference is about 15.7 feet.
78.5 ft2(3.14)(5ft)2
pi * 5 = 15.7079633 Circumference = pi * Diameter
.4r=5 r=5/.4 r=12.5 c=2pi(12.5) c=25pi ft
5.0
5ft * Pi = Approximately 15.7ft
The formula for finding the Area is A = Pi x R-squared, where Pi is 3.1416 and R-squared is the radius multiplied by itself: A = 3.1416 x (5 x 5)= 3.1416 x 25 = 78.54 sq ft. The formula for finding the circumference is C = Pi x D where Pi is 3.1416 and D is the diameter (diameter is Radius x 2): C = 3.1416 x 10 = 31.416 ft.
the formula to start off with is the circumference is pi x diameter therefore re-arranging the formula the diameter is the circumference divided by pi diameter = circumference / pi = 18ft 8in / 3.1415 = 5ft and 11 inches to the nearest inch (to be more precice to diameter is 5ft 11.3 inches--- note it is more difficult to work in feet and inches and easier to work in metres and centimetres)
The radius is half of the diameter so it is 2.5 Feet.
Radius is = to half the diameter so.... when the radius of the semicircle is 5ft then the diameter is 10ft.