416=3.14*r^2*26

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Solution for 416=3.14*r^2*26 equation: 



416=3.14r^2*26

We move all terms to the left:

416-(3.14r^2*26)=0

We get rid of parentheses

-3.14r^2*26+416=0

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

-3.14r^2*26=-416

r=-416/1

r=-416

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