Ok so im taking a 25 question test. the passing number is 8..how do the get to that number

Ok so itsa math question? I really don't see how you should be able to pass the test because half of 20 is 10 and half of 25 is 12.5

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