Find the radius of the circle (if it gives you the diameter just half it to get the radius) and then square it. Then times your answer by pie. So the formula is:
A= pie (r squared)
P.S. Sorry I couldn't get the mathematical symbols!
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Area of a circle = pi*radius2
Find the area of the circle and divide by 4.
divide it by three, tha area
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