175=3.14*r*21

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Solution for 175=3.14*r*21 equation:


Simplifying
175 = 3.14r * 21

Reorder the terms for easier multiplication:
175 = 3.14 * 21r

Multiply 3.14 * 21
175 = 65.94r

Solving
175 = 65.94r

Solving for variable 'r'.

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

Add '-65.94r' to each side of the equation.
175 + -65.94r = 65.94r + -65.94r

Combine like terms: 65.94r + -65.94r = 0.00
175 + -65.94r = 0.00

Add '-175' to each side of the equation.
175 + -175 + -65.94r = 0.00 + -175

Combine like terms: 175 + -175 = 0
0 + -65.94r = 0.00 + -175
-65.94r = 0.00 + -175

Combine like terms: 0.00 + -175 = -175
-65.94r = -175

Divide each side by '-65.94'.
r = 2.653927813

Simplifying
r = 2.653927813

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