From the figure, the perimeter of A is: \(x.4=4x\), the perimeter of B is: \(2x.4=8x\) and the perimeter of C is: \(3x.4=12x\). The perimeter not in the big figure is: \(x+x+2x+2x=6x\)

So the perimeter of he big figure is: \(4x+8x+12x-6x=18x\)

WhySoSerious's answer is not correct.

Name the points as shown

P_ACDG = 2[(x + 2x + 3x) + 3x] = 18x

We see that : AB + AH = HI + IK + KL + BL

=> P_BCDGHIKL = P_ACDG = 18x

Yes, thanks Lê Quốc Trần Anh :(( I will do better next time :)

The perimeter of square A is \(4x\)

The perimeter of square B is \(8x\)

The perimeter of square C is \(12x\)

The perimeter of the entire figure is \(4x+8x+12x=24x\)(unit)