Not sure if you still need the answer
But it's 120+20[tex]\pi[/tex]
Because the 3 boxes in the middle are cubes, all three are 10x10, and perimeter of a cube is each side added up.
All together it would be 40+40+40 which equals 120.
Then for the semi-circles, the perimeter formula is 1/2([tex]\pi[/tex]d) d standing for diameter. Since we can tell that the diameter takes up 2 full cubes, we know that the diameter is 20. However since it's a semi-circle we cut that in half. So 10[tex]\pi[/tex]
10[tex]\pi[/tex]+10[tex]\pi[/tex]=20[tex]\pi[/tex]
So then your final answer is 120+ 20[tex]\pi[/tex]
I hope my answer was clear enough!
