Solve for A
A=400\pi \approx 1256.637061436
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A≔400\pi
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A=2500\times \frac{\pi }{4}-30^{2}\times \frac{\pi }{4}
Calculate 50 to the power of 2 and get 2500.
A=625\pi -30^{2}\times \frac{\pi }{4}
Cancel out 4, the greatest common factor in 2500 and 4.
A=625\pi -900\times \frac{\pi }{4}
Calculate 30 to the power of 2 and get 900.
A=625\pi -225\pi
Cancel out 4, the greatest common factor in 900 and 4.
A=400\pi
Combine 625\pi and -225\pi to get 400\pi .
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