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Perimeter of shapes with arcs

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Problem

Two equal semicircles of radius 4 cm fit inside a larger semicircle of radius 8 cm.
Find the perimeter of the shape.
Note: Enter your answer in terms of π.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
π cm
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