Question

hey mates plz answer this. plz

Answer 1

Easy let's say divide angle ABC into 2 that is angle 1and angle2 then in angle CD also we have angle 4and 3 then angle 1=angle3 since both lines are parallel by alt.int angles now we have angle 1=angle2and angle 3=4 therefore angle 2=angle 4 now add angle1and2=angle3+4 you will have your answer

Answer 2

For 6)
angle 1=angle 2=angle 3= angle 4-----(Angles of incidence = Angle of reflection.)
angle 1 + angle 2= angle 3+ angle 4
so, angle ABC= angle BCD
Hope this helps you friend
Thanks ✌️ ✌️