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s.DBC = 65derajat
besar sudut segitiga seluruhnya = 180derajat, jadi :
DBC+DAC+BCD = 180
65 + 65 + BCD = 180
130 +BCD = 180
BCD = 180-130 = 50drjt
atau yg ini, soalnya sy jg ragu dgn jwn diatas
DAC = 65drjt
DBC = 180-145 = 35drjt
BCD =? ,, JADI
DAC + DBC + BCD = 180 (180 krna jmlah sudut pelurus)
65+35+BCD = 180
100+BCD = 180
BCD = 180-100 = 80drjt