If a central angle measures 87á, then its arc will measure

a. half as much
b. twice as much
c. the same

If a central angle measures 87º (i think is the easure you are talking about) then its arc wil measure the same because  the length of the arc equals the radian measure of the angle.

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