Pi is just a number . . . there is no area to find.
However, if you wanted to find the area of a circle, you could multiply the circle's radius time its radius, again, then multiply that answer by pi.
If you have a simple pocket calculator, you can find the value of pi to an accuracy of 2 millionth's of a percent. Using the first 6 odd numbers, "113355", simply divide the last 3 numbers (355) by the first 3 numbers (113).
A value of pi of 3.14159 is sufficient for most math needs. Actually 3.14 is quite good for the majority of math problems.
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the area of a circle is 2 X pi radius
Area of the circle = pi*radius2 = pi*52
Area = (pi) x (Radius)2 (Radius)2 = Area/pi Radius = sqrt(Area/pi) Diameter = 2 x radius = 2 x sqrt(Area/pi)
Area = pi*radius2 So, radius = sqrt(area/pi)
Area = pi*r2 Area = pi(4.2)2 = 55 units2 ========