It is known that the length of the base of an isosceles triangle is 15cm. If the difference between the two parts is 8cm, the waist length is______ cm．

It is known that the length of the base of an isosceles triangle is 15cm. If the difference between the two parts is 8cm, the waist length is______ cm．

If x = 23, the three sides of the triangle are 23cm, 23cm and 15cm respectively, which can form a triangle. If x = 7, the three sides of the triangle are 7cm, 7cm and 15cm respectively, ∵ 7 + 7 = 14 < 15, ∵ 7cm, 7cm and 15cm, which can not form a triangle. To sum up, the waist length is 23cm

The length of the base of an isosceles triangle is 6cm. The middle line of a waist divides the circumference of the triangle into two parts. The difference between the two parts is 3cm. Calculate the waist length

6+3=9cm
6-3 = 3cm