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Simplifying 90 = 2 * 3.1415926536r Multiply 2 * 3.1415926536 90 = 6.283185307r Solving 90 = 6.283185307r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.283185307r' to each side of the equation. 90 + -6.283185307r = 6.283185307r + -6.283185307r Combine like terms: 6.283185307r + -6.283185307r = 0.000000000 90 + -6.283185307r = 0.000000000 Add '-90' to each side of the equation. 90 + -90 + -6.283185307r = 0.000000000 + -90 Combine like terms: 90 + -90 = 0 0 + -6.283185307r = 0.000000000 + -90 -6.283185307r = 0.000000000 + -90 Combine like terms: 0.000000000 + -90 = -90 -6.283185307r = -90 Divide each side by '-6.283185307'. r = 14.32394488 Simplifying r = 14.32394488
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