Posted by greeny on Tuesday, October 2, 2012 at 9:09pm.
a sector of angle θ in a circle of radius r is 1/2 r^2 θ
110° = 110/180 pi = 1.92
20 * 1.92^2 = 38.4
(20-16)* 1.92^2 = 7.7
38.4-7.7 = 30.7 in^2
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