Bunuel wrote:

In the figure above, a circular hoop is rolling along a flat surface on a straight line. If point A touches the surface at 25 inch intervals, then the radius of the hoop is approximately

(A) 8 inches

(B) 7 inches

(C) 6 inches

(D) 5 inches

(E) 4 inches

Attachment:

2017-11-15_1036_003.png

point A makes complete revolutions in 25 inch interval.

Circumference = 2*pi*r = 25

r = 4 inches approx.

E

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