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8² = 16NL
NL = 64/16 = 4 cm ==> MN = 12cm
KN² = MN × NL
KN = √12 × 4 = √48 = 4√3 cm
luas segitiga = KL × NL = 4√3 × 4 = 16√3 : 2 = 8√3 cm²