pi*r^2*12=258.75

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Solution for pi*r^2*12=258.75 equation: 


Simplifying
pi * r2 * 12 = 258.75

Reorder the terms for easier multiplication:
12ip * r2 = 258.75

Multiply ip * r2
12ipr2 = 258.75

Solving
12ipr2 = 258.75

Solving for variable 'i'.

Move all terms containing i to the left, all other terms to the right.

Divide each side by '12pr2'.
i = 21.5625p-1r-2

Simplifying
i = 21.5625p-1r-2

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