4 sides. Think of a trapezoid like a drunk rectangle.
-Hope this helps!
Y = kx
Plug in what we know:
5 = k(8)
5 = 8k
Divide 8 to both sides:
k = 0.625
Plug this back into the equation along with y = 15:
y = kx
15 = 0.625x
Divide 0.625 to both sides:
x = 24
It would be 4.4mm/.5 mm x 4 cm = 35.2 cm
From the looks of it, I believe it is either 120, 125, or 126. If you have options, let me know so I can take a closer look.