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Natalka [10]
3 years ago
15

Please please please help

Mathematics
1 answer:
natita [175]3 years ago
5 0

Answer:

D

Step-by-step explanation:

given A = π(R² - r²)

divide both sides by π, hence

R² - r² = \frac{A}{\pi }

add r² to both sides

R² = \frac{A}{\pi } + r²

Take the square root of both sides

R = \sqrt{A/\pi+r^2 } → D



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