Obra drove 150π meters along a circular track. If the area enclosed by the circular track on which she drove is 57,600π square meters, what percentage of the circular track did Obra drive?
Choices
A) 6.67%	B) 12.5%	C) 18.75%	D) 25%	E) 31.25%
area enclosed by the circular track on which she drove is 57,600π square meters   So, π(r^2) = 57,600π ---&gt; (r^2)=57,600 ---&gt; r=240   Circumference of the circular track = 2πr = 480π   Therefore, part of circumference covered = 150π/480π =31.25%   Hence, answer is 31.25%.
<result>E</result>
Obra drove 150π meters along a circular track. If the area enclosed by the circular track on which she drove is 57,600π square meters, what percentage of the circular track did Obra drive?