PP2-PS-165

[purpleme]

165. 17668-!-item-!-187;#058&011589

A circular cloth with a diameter of 20 inches is placed on a circular tray with a diameter of 24 inches. What fraction of the tray's surface is not covered by the cloth?

(A) 1/6
(B) 1/5
(C) 11/36
(D) 25/36
(E) 5/6

答案:C

請問要怎麼算阿?
我怎麼算都是44pei/144pei
但是約分後11/25沒有這個答案
是我哪裡算錯了嗎....

[oneseven]

you are too careless.

checking 44/144 again!!