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= 180 - 120
= 60 derajat
sudut BED
= 180 - 140
= 40 derajat
C. Sudut DBE
= 180 - (60 + 40)
= 180 - 100
= 80 derajat
mencari sudut CBE dan ABD
= 180 = 80 + 2x
= 180 - 80 = 2x
= 100 / 2 = x
= 50 = x
A. CBD
= DBE + CBE
= 80 + 50
= 130 derajat
CBE = 50 derajat sama dengan sudut ABD