66=3.14*r2*32

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Solution for 66=3.14*r2*32 equation: 



66=3.14r^2*32

We move all terms to the left:

66-(3.14r^2*32)=0

We get rid of parentheses

-3.14r^2*32+66=0

We move all terms containing r to the left, all other terms to the right

-3.14r^2*32=-66

r=-66/1

r=-66

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