Question

I want the answer to this particular question

Answer 1

BCD+BCE=180(linear pair angle)
BCD+105=180(given)
BCD=180-105=75
BCD =75...(1)

BAD=BCD(opposite angle of a
Parallelogram)...(from1)
BAD=75.....(2)

ABC=ADC(opposite side of a
Parallelogram)......(3)

ABC+BCD+ADC+BAD=360
.......(measure of an quadrilateral)
ABC+75+ADC+75=360...(from 1,2)
ABC+75+ABC+75=360....(from3)
2ABC+150=360
2ABC=360-150
2ABC=210
ABC=201/2
ABC=105....(4)

ADC=105...(from 3,4)