10=4(3.14)r^2

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Solution for 10=4(3.14)r^2 equation:


Simplifying
10 = 4(3.14) * r2

Multiply 4 * 3.14
10 = 12.56r2

Solving
10 = 12.56r2

Solving for variable 'r'.

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

Add '-12.56r2' to each side of the equation.
10 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
10 + -12.56r2 = 0.00

Add '-10' to each side of the equation.
10 + -10 + -12.56r2 = 0.00 + -10

Combine like terms: 10 + -10 = 0
0 + -12.56r2 = 0.00 + -10
-12.56r2 = 0.00 + -10

Combine like terms: 0.00 + -10 = -10
-12.56r2 = -10

Divide each side by '-12.56'.
r2 = 0.7961783439

Simplifying
r2 = 0.7961783439

Take the square root of each side:
r = {-0.892288263, 0.892288263}

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