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KOL : penyiku = 2:3
KOL : 90 = 2:3
dikali silang
3(KOL) = 2 (90)
3(KOL) = 180
KOL = 180/3
sudut KOL = 60 derajat
KOL+penyiku=90 derajat
Kol=2/5x90=2x18=36 derajat
Maaf kalo salah^^