25.7831 (to 4 dp)
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The Egyptians used 256 divided with 81 to calculate pi.
Divide the 81 pi by pi, then square root it. (Use the formula for area of circle, which gives 81pi=pi*radius squared, but rearrange to find the radius). i.e. it's the square root of 81
(pi) R2 x 34 = 81 pi R2
1.27323954474
The radius of a circle whose circumference is 36 pi (113.1) is: 18 (circumference divided by Pi divided by 2 = radius)