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615=3.14r
We simplify the equation to the form, which is simple to understand
615=3.14r
We move all terms containing r to the left and all other terms to the right.
-3.14r=-615
We simplify left and right side of the equation.
-3.14r=-615
We divide both sides of the equation by -03.14 to get r.
r=195.859872611
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