A=3.14(r-3)2

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Solution for A=3.14(r-3)2 equation: 


Simplifying
A = 3.14(r + -3) * 2

Reorder the terms:
A = 3.14(-3 + r) * 2

Reorder the terms for easier multiplication:
A = 3.14 * 2(-3 + r)

Multiply 3.14 * 2
A = 6.28(-3 + r)
A = (-3 * 6.28 + r * 6.28)
A = (-18.84 + 6.28r)

Solving
A = -18.84 + 6.28r

Solving for variable 'A'.

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

Simplifying
A = -18.84 + 6.28r

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