Question

the perimeter of an isosceles triangle is 131/20 cm if one of its equal sides is 7/5 cm find the third side​

Answer 1

Answer:

15/4

Step-by-step explanation:

Let the third side be x

perimeter of triangle= sum of all sides

perimeter of triangle= sum of all sides131/20= 7/5+7/5+x

131/20=14/5+x

131/20-14/5=x

75/20=x

15/4=x

Answer 2

Answer:

Consider a triangle ABC

such that

AB=AC=7/5

Also AB+AC+BC =131/20

7/5 + 7/5 + BC= 131/20

14/5 + BC = 131/20

BC = 131/20 -14/5

BC = 75/20

BC = 15/4 cm

thus, the third side is 15/4cm