Answer:

..

Step-by-step explanation:

let sides of triangle be 12x, 11x, 7x

perimeter =sum of all sides

550=12x+11x+7x

550=30x

x=550/30

x=55/3m

1st side=12x=12x55/3 =220m

2nd side=11x=11x55/3=220m [approx]

3rd side=7x=7x55/3=110m[approx]