The base of an isosceles triangle is 3 cm less than the length of the equal sides if the perimeter of the triangle is 36 cm find the length of each sides?

b=l-3

P=2l+b

36=2l+b

Sub b=l-3 into 36=2l+b

36=2l+b

36=2l+(l-3)

36=2l+l-3

39=3l

l=13 cm

Sub l=13 into b=l-3.

b=l-3

b=13-3

b=10 cm

Therefore, the length of each of the two equal sides is 13 cm and the base is qual to 10 cm.