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<KLN = 180 - < MLN
<KNL + <KLN + <LKN = 180 (jumlah sudut dalam segitiga)
<KNL + 180- < MLN + <LKN = 180
<KNL + < LKN - <MLN = 180 -180 =0
<KNL + <LKN = <MLN
<KNL = <MLN - <LKN
<KNL = 47 - 13 = 34
.caralain ada di gambar lampiran