Question

the length of the three sides of a triangle are X CM X and and 6 cm and the perimeter is 20 cm find x

Answer 1

Perimeter=Sum of all sides

ie,    20=x+x+6

        2x+6=20

        2x=20-6

        2x=14

        x=7      

Therefore , the value of x is 7 CM

Answer 2

Perimeter of a triangle=sum of all sides

20 =X+X+6

2X=14

X=14/2=7cm