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The area of the shaded sector is one-fourth of the area of the whole circle so:
area of shaded region
The area of the shaded region is 9pi units^2
area of shaded region
The area of the shaded region is 9pi units^2
r=common ratio: 12/6=2; 6/3=2
r=2,
plug in 12 for n:
The twelfth term in the sequence is 6144