PS,谢谢!

joywzy

这题的图我贴不上去,我描述一下:一个长方形,长20feet,宽6feet, X是切线与长的夹角,,A,B,C依次在一条长上.形成四个面积相等的梯形.

18. The figure above shows the dimensions of a rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C, as indicated. If x = 45, what is the length AB ?  
   (1 foot = 12 inches)

   (A) 5 ft 6 in
   (B) 5 ft   in
   (C) 5 ft 3 in
   (D) 5 ft
   (E) 4 ft 9 in
答案

我算的是8.不是选项中的答案.

tongxun

没看明白题目。是OG的题目吗？那一题？

joywzy

不是,是新东方的数学PS的section 25-18.