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4/5 PI radians = 144 degrees
sector area = central angle / 360 * PI * radius^2
sector area = 144 / 360 * PI * 11^2
sector area = <span> <span> <span> 152.0530844337 </span> </span> </span> square centimeters
sector area = <span> <span> <span> 152.05 </span></span></span>square centimeters
sector area = central angle / 360 * PI * radius^2
sector area = 144 / 360 * PI * 11^2
sector area = <span> <span> <span> 152.0530844337 </span> </span> </span> square centimeters
sector area = <span> <span> <span> 152.05 </span></span></span>square centimeters