Answer:
angle a + angle b + angle c = 180 (angle sum property)
a + 45+55= 180
a + 100 = 180
a = 180-100
a= 80
AD bisects angle a
i.e angle ADB= angle ADC
angle ADB + angle ADC = 80
angle ADB + angle ADB =80
2angleADB= 80
angle ADB = 80/2
angle ADB = 40
angle ADB = angle ADC
40 = angle ADC
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