e=3.14r*r

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Solution for e=3.14r*r equation: 


Simplifying
e = 3.14r * r

Multiply r * r
e = 3.14r2

Solving
e = 3.14r2

Solving for variable 'e'.

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

Simplifying
e = 3.14r2

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