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Lebar = 6 cm
Tinggi = 4 cm
Cari alas segitiga KM dengan pitagoras.
KM² = KL² + LM²
KM² = 12² + 6²
KM² = 144 + 36
KM = √180
KM = 6√5 cm
Luas segitiga PKM = 1/2.PK.KM
L = 1/2.4.6√5
L = 12√5 cm