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mezya [45]
3 years ago
10

The area of the shaded region of circle O is 9π m2

Mathematics
1 answer:
blsea [12.9K]3 years ago
5 0
For full circle area is π * R² [here R = radius],
for a sector of circle with angle β, area will be = (β/2) * R², β is in radian,
here let β = 22.5° = (π * 22.5/180) = π/8 radian,
now [(π/8)/2] * R² = 9π, [π/16] * R² = 9π
R² = 9 * 16 = 144, 
R = √144 = 12 m
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