The circumference of an isosceles triangle is seven tenths of a meter, and its base is one fifth of a meter
Waist length: (7 / 10-1 / 5) △ 2 = 1 / 2 △ 2 = 1 / 4m
The circumference of an isosceles triangle is 8.2 cm, the waist length is a cm, and how many cm is the bottom
8.2-2a