Question

please answer this question!!

Answer 1

ad=ad (common)
AB=AC
BD=DC
by SSS congruence rule .∆ABDcongruent to ACD
angle ABD+angle ADC=180 ° (as bc isa straight line is forming a linear pair
ang.ABD=ang.ADC
2ang.abd=180
abd =90°
ang.b=ang.c(ang opposite to equal sides are equal)
ang.BAD=ang.CAD(cpct)