Take the tree as a cylinder, open the side of the tree and turn it into a rectangle (length 4*3. 14= 12.56 m, width 9 m). When the vines are wound three times to reach the top of the tree, the length of the tree is divided into three equal rectangles (length 12.56 m, width 3 Then it is: x square =3 square+12.56 square (Pythagorean theorem), the value of x is: 12.9 1 m, and the final total length is equal to 3x =12.91* 3 = 38.73m.