x+2x= 18 x=6

So the waist is 12㎝ and the bottom is 6㎝.

Question 2: There are two situations:

1. When the side of 10㎝ is the bottom, the waist length is (25-10) ㎝ 2 = 7.5 ㎝.

2. When the side of10 ㎝ is waist length, the bottom side is 25- 10×2=5㎝.