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Pi, by itself is not enough. You need the radius which is the length from the centre of the circle to its circumference (its boundary). If the radius is r, then the area is pi*r*r If, instead of the radius, you have a diameter - the length from one side to the other, through the centre - then radius = diameter/2. Once you have r you can calculate the area. If you have the circumference, then that is 2*pi*r and from that you can determine r and so calculate the area.
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