25=4/3*3.14*r^2

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Solution for 25=4/3*3.14*r^2 equation: 



25=4/3*3.14r^2

We move all terms to the left:

25-(4/3*3.14r^2)=0



Domain of the equation: 3*3.14r^2)!=0

r!=0/1

r!=0

r∈R



We get rid of parentheses

-4/3*3.14r^2+25=0

We multiply all the terms by the denominator


25*3*3.14r^2-4=0

Wy multiply elements

225r*3-4=0

Wy multiply elements

675r-4=0

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

675r=4

r=4/675

r=4/675

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