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Simplifying
54 = (3.14r2)(2)
Remove parenthesis around (3.14r2)
54 = 3.14r2(2)
Reorder the terms for easier multiplication:
54 = 3.14 * 2r2
Multiply 3.14 * 2
54 = 6.28r2
Solving
54 = 6.28r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-6.28r2' to each side of the equation.
54 + -6.28r2 = 6.28r2 + -6.28r2
Combine like terms: 6.28r2 + -6.28r2 = 0.00
54 + -6.28r2 = 0.00
Add '-54' to each side of the equation.
54 + -54 + -6.28r2 = 0.00 + -54
Combine like terms: 54 + -54 = 0
0 + -6.28r2 = 0.00 + -54
-6.28r2 = 0.00 + -54
Combine like terms: 0.00 + -54 = -54
-6.28r2 = -54
Divide each side by '-6.28'.
r2 = 8.598726115
Simplifying
r2 = 8.598726115
Take the square root of each side:
r = {-2.932358456, 2.932358456}
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