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ABD = 41
Dijawab :
Misal,
Titik pusat = O
Maka,
AOB = 90 derajat
BAO = 49 derajat
AOD = 90 derajat
ADO = 41 derajat
DAO = 49 derajat
BOC = 90 derajat
CBO = 41 derajat
BCO = 49 derajat
DOC = 90 derajat
DCO = 49 derajat
CDO = 41 derajat
ABD = 82 derajat
BCD = 98 derajat
CDA = 82 derajat
BAD = 98 derajat
Itu jawabannya.