250=.7854*D^2

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Solution for 250=.7854*D^2 equation: 


Simplifying
250 = 0.7854D2

Solving
250 = 0.7854D2

Solving for variable 'D'.

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

Add '-0.7854D2' to each side of the equation.
250 + -0.7854D2 = 0.7854D2 + -0.7854D2

Combine like terms: 0.7854D2 + -0.7854D2 = 0.0000
250 + -0.7854D2 = 0.0000

Add '-250' to each side of the equation.
250 + -250 + -0.7854D2 = 0.0000 + -250

Combine like terms: 250 + -250 = 0
0 + -0.7854D2 = 0.0000 + -250
-0.7854D2 = 0.0000 + -250

Combine like terms: 0.0000 + -250 = -250
-0.7854D2 = -250

Divide each side by '-0.7854'.
D2 = 318.3091418

Simplifying
D2 = 318.3091418

Take the square root of each side:
D = {-17.8412203, 17.8412203}

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