[問題]考古題Form19 sec5 PS-Q14

[凱薩琳]

A runner ran along the inside edge of a circular track for a distance of 1/2 mile. If the inside radius of the track is 100 feet, approximayely how many times did the runner run completely around the track?(1 mile=5,280 feet)

(A)4
(B)6
(C)13
(D)18
(E)26

Ans:A

[StanleyHuang]

一圈 = 2*PI*r = 2*3.14*100 = 628 ft
所求 = (5280*0.5)/628 = 4.2 圈
所以選 (A)

[凱薩琳]

謝謝.. 原來是我有個地方弄錯了