It is fairly easy if you know what radius, diameter, and pi are. Basically all you have to do is multiply the radius by itself and then multiply your answer by pi. πr squared.
If all you have is the diameter, then divide the diameter by two and then do the formula.
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Area of a circle = pi*radius2
Find the area of the circle and divide by 4.
how do you find the area of a semi circle
Find the area of the whole circle and divide by two. Area of semicircle = 0.5*pi*r2, where pi = 3.14159 and r is the radius
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.