400=3.14*r^2*25

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Solution for 400=3.14*r^2*25 equation: 



400=3.14r^2*25

We move all terms to the left:

400-(3.14r^2*25)=0

We get rid of parentheses

-3.14r^2*25+400=0

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

-3.14r^2*25=-400

r=-400/1

r=-400

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