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12 16 20
jadi jwbn nya 12
20(pangkat2) = 16(pangkat2) + AD(pangkat2)
400 = 256 + AD(pangkat2)
400 - 256 = AD(pangkat2)
144 = AD(pangkat2)
144(akar dari) = AD(pangkat2)
12 = AD
jadi,panjang AD adalah 12 cm