Obra drove 140π 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?  Choose the correct choice.
A) 6.67%
B) 12.5%
C) 18.75%
D) 29.16%
E) 33.3%
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 = 140π/480π =29.16%   Hence, answer is 29.16%.
<result>D</result>
Obra drove 140π 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?