It is known that in the isosceles triangle ABC, the center line BD on a waist AC divides the circumference of the triangle into two parts 9cm and 15cm, and calculates the waist length and the bottom length of the triangle

It is known that in the isosceles triangle ABC, the center line BD on a waist AC divides the circumference of the triangle into two parts 9cm and 15cm, and calculates the waist length and the bottom length of the triangle

Let the waist length be X. when the waist length and half of the waist length are 9cm, x + 12x = 9, the solution is x = 6, so the bottom edge = 15-12 × 6 = 12, ∵ 6 + 6 = 12, ∵ 6cm, 6cm, 12cm cannot form a triangle. When the waist length and half of the waist length are 15cm, x + 12x = 15, the solution is x = 10, so the bottom edge = 9-12 × 10 = 4, so