P1-PS-70

[Huang Hsin-Yi]

70. 8158-!-item-!-187;#058&005842
The perimeters of square region S and rectangular region R are equal. If the sides of R are in the ratio 2 : 3, what is the ratio of the area of region R to the area of region S ?

(A) 25 : 16
(B) 24 : 25
(C) 5 : 6
(D) 4 : 5
(E) 4 : 9

Ans:B

真是很奇怪,怎樣算都是8:9

[sunnyblue13s]

設: 長方形R周長=2+2+3+3 = 正方形S周長
則，S邊長=10/4

面積比R:S = (2*3):(5/2*5/2)=24:25

(B) - correct!!

[Huang Hsin-Yi]

我哩!原來我把題目看成 長方邊:正方邊=2:3
還一直猛算~~~~~~~~~~~~~~

感謝囉!!!