-- Write down (pi) with as many of its decimal places as you choose to use
-- Write '8' under it.
-- Carry out the multiplication.
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The formula for finding the area of any circle is pi*radius2..
Pi is the number you have to use to solve many circle equations. If you want to find the area of a circle, use radius squared times pi. For the circumference, use diameter times pi.
You use the formula A=(pi)r^2 solve for r which will give you the square root of A/pi. In your case the area has pi already in it so it is just 2 times the square root of 8.
The surface area of a sphere can be calculated with the formula: A = 4[pi]r2 Plug in r: A = 4[pi](8)2 And solve: A = 256[pi]
With pi rounded to 8 digits, it is 24.000008.