Question

One side of an isosceles triangle is 15 if the perimeter of triangle is 55 then the length of each of its equal side is

Answer 1

Answer:

$20$

or

$15$

Answer 2

Answer:

let say A, B, C is an isosceles triangles with 15 = BC and AB =AC

then

perimeter = 55

perimeter of triangle = AB+BC+CA

55 = AB+AB+15 (since AB=AC)

55=2AB +15

2AB=55-15

AB=40/2

AB=20=AC (equal sides)