Respuesta :

Perimeter is the sum of all sides, Two sides is unknown here, it would be:
11 - 6 = 5  [ Bottom Side ]
9 - 5 = 4  [ Left Side ]

Now, P = 9 + 11 + 4 + 6 + 5 + 5
P = 40 cm

In short, Your Answer would be: 40 cm

Hope this helps!
5 because 11-6=5 its 11-6 because the missing angel is going horizontally so you subtract the horizontal angels.  

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