Question 350083
let first side be x dm
second side = 2x-2
third side =2(2x-2)-4
..
x+2x-2+4x-4-4 =18
7x-10=18
7x = 28
x= 4 first side
2x-2 = 8-2 =  6 second side
third side = 2(2*4-2)-4=8
..
4+6+8 =18dm