The ideal length of a particular metal rod is 30.5 cm. the measured length may vary from the ideal length by at most 0.015 cm. what is the range of acceptable lengths for the rod?

The rod may be 30.5 +- 0.015
30.5 + 0.015 = 30.515
30.5 - 0.015 = 30.485
The range of acceptable lengths is 30.485 to 30.515 cm

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