SA=4*3.14r*2

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Solution for SA=4*3.14r*2 equation: 


Simplifying
SA = 4 * 3.14r * 2

Reorder the terms for easier multiplication:
AS = 4 * 3.14 * 2r

Multiply 4 * 3.14
AS = 12.56 * 2r

Multiply 12.56 * 2
AS = 25.12r

Solving
AS = 25.12r

Solving for variable 'A'.

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

Divide each side by 'S'.
A = 25.12rS-1

Simplifying
A = 25.12rS-1

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