900=4*3.14r2

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Solution for 900=4*3.14r2 equation: 



900=4*3.14r^2

We move all terms to the left:

900-(4*3.14r^2)=0

We get rid of parentheses

-4*3.14r^2+900=0

Wy multiply elements

-12r+900=0

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

-12r=-900

r=-900/-12

r=+75

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