3.14r^2=78.5

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Solution for 3.14r^2=78.5 equation: 


Simplifying
3.14r2 = 78.5

Solving
3.14r2 = 78.5

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 = 25

Simplifying
r2 = 25

Take the square root of each side:
r = {-5, 5}

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