Question

please solve immediately......

Answer 1

let BAD is a straight line

BAC+CAD = 180 (linear pair)

90+90=180

ACD=45 (exterior angle prop.) BAD is exterior angle of triangleACD

BCA=45 (exterior angle prop.)

BAD is exterior angle of triangle ABC

BCA+ACD=BCD

45+45=90

SO angle BCD is an right angle

proof