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b. AED = 180 - BED = 180 - 120 =60 derajat
c. DBC = (180 - DAE) -30
= (180 - 60) - 30
= 120 - 30
= 90 derajat
d. BDC = DBA (dalam berseberangan)
BDC = 30 drajat
e. ADE = 180 - (DAE + AED)
= 180 - (60 + 60)
= 60 derajat
f. BCD = DAE
BCD = 60 derajat