Me find the perimeter of 7, 8, and 9 . : )

Number nine 24 cm  the unidentified side is 5 cm

I can give you 8) and 9) but the proportions of 7) are rather strange.

8) 24cm
2+3+3= 8, length of left side.
8+8=16, length of both sides.
4+3+3= 10, length of upper side. 10-2= length of lower side. 16+10+8= 24
Your perimeter is 24.

9) 32cm
8 = length of upper side.
6+2= 8, Length of left side, or both sides.
Perimeter = 8x2+8x2, or 32.

Subtracting is the opposite of adding

I’m not sure about that