Question

In the ABC, AC = BC, AD = BD and angle BDC = 120°. Find angle ADB.​

Answer 1

Answer:

since AC = BC ,(given)

therefore (ADC) =(BDC) ,{ the angle which are opposite to equal lines are equal}

now, ADC+BDC+ADB=360°

120+120+BDA=360

therefore BDA=360-240

=60°