Acoin is tossed 4 times. if h denotes heads and t denotes tails, the event "at most 1 head" is represented by

The most you could have is 4:4
But the least is 0:4

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's