So a group of students are in a club. half are boys ,4/9 of the boys have brown eyes. how many boys have brown eyes?

it will have to be 5/9 or0.5555555556

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