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Sudut ABC = Sudut siku-siku (90 derajat)
Sudut BAC = Sudut lancip (<90 derajat)
Sudut BCA = Sudut lancip (<90 derajat)
gambar 2 =
Sudut ABC = Sudut Lancip
Sudut ABD = Sudut Lancip
Sudut BDC = Sudut Tumpul
Sudut DCA = Sudut Lancip