70=3.14*r^2

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Solution for 70=3.14*r^2 equation: 


Simplifying
70 = 3.14r2

Solving
70 = 3.14r2

Solving for variable 'r'.

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

Add '-3.14r2' to each side of the equation.
70 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
70 + -3.14r2 = 0.00

Add '-70' to each side of the equation.
70 + -70 + -3.14r2 = 0.00 + -70

Combine like terms: 70 + -70 = 0
0 + -3.14r2 = 0.00 + -70
-3.14r2 = 0.00 + -70

Combine like terms: 0.00 + -70 = -70
-3.14r2 = -70

Divide each side by '-3.14'.
r2 = 22.29299363

Simplifying
r2 = 22.29299363

Take the square root of each side:
r = {-4.721545682, 4.721545682}

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