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b. panjang RS = 12 kuadrat : 8
= 144: 8 = 18 cm
c. panjang PQ = 12 kuadrat + 8 kuadrat
= 144 + 64 = akar 208 = 14,42 cm
panjang PR = 48 ×2 : 14,42 = 6,66cm