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EF2 = EO2 + FO2
EF2 = 12 x 12 + 16 x 16
EF2 = 144 + 256
EF2 = 400
EF = akar dari 400
EF = 20 cm
b. panjang EG
EG2 = EO2 + DO2
EG2 = 12 x 12 + 5 x 5
EG2 = 144 + 25
EG2 = 169
EG = akar dari 169
EG = 13 cm