Using the rules for significant figures, what do you get when you add 24.545 and 307.3?

307.3 + 24.545 = 331.845

331.845 is your answer

hope this helps

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