A=(pi)r2
d=2r
Divide the given area by pi(3.14) and take the square root. This is the radius so multiply by 2 to get the diameter.
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A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
A = pi x d2 / 4
multiple the diameter by 2 to get the radius, then use your equation and go from there
depends greatly on the thing you are working with. assuming a circle with area A the diameter is 2*sqrt(A*pi) since A =r*r*pi and diameter=2*r
Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter