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DAB = 2 x 40 = 80
ABD = (180 - 80) / 2 = 50
BDA = ABD = 50
ADC = (180 - 80) = 100
CDB = ADC - BDA = 100 - 50 = 50 derajat
dab=2×40=8
abd=(180-80)/2=50
bda=abc=50
adc=(180-80)=100
cdb=adc-bda=100-50=50°