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L = 1/2 X (SR+PQ) X ST
144 = 1/2 X (SR+2SR) X 8
144 = 1/2 X 3SR X 8
144 = 3SR X 4
144 = 12 SR
SR = 144/12
SR = 12 cm
K = PQ + SR + 2PS
K = 2SR + SR + 2(5/6SR)
K = 3SR + 10/6SR
K = 18/6SR + 10/6SR
K = 28/6SR
K = 28/6 X 12
K = 28X2
K = 56 cm
Jawabannya c.
Maaf, kalau salah..