3.14r^2=225(3.14)

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Solution for 3.14r^2=225(3.14) equation: 


Simplifying
3.14r2 = 225(3.14)

Multiply 225 * 3.14
3.14r2 = 706.5

Solving
3.14r2 = 706.5

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '3.14'.
r2 = 225

Simplifying
r2 = 225

Take the square root of each side:
r = {-15, 15}

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