Jawabanmu

2014-01-28T22:17:03+07:00
K = PQ + PS + SR + QR
# PQ = PS
# SR = QR

# PQ = akar 144 + 81
   PQ = 15 cm

# SR = akar 1600 + 81
  SR = 41 

jadi K = (2.15) + (2.41) = 30 + 82 = 112 cm