The ratio of the two adjacent sides of an isosceles triangle is 2:5. Its circumference is 108 cm. What is the length of its bottom edge?

The ratio of the two adjacent sides of an isosceles triangle is 2:5. Its circumference is 108 cm. What is the length of its bottom edge?

The sum of the two sides of a triangle is greater than the third
Therefore, the waist length is 5 and the bottom length is 2
5+5+2=12
108 △ 12 = 9 cm
Base length: 9 × 2 = 18 cm