Question

In the figure, AB=BC=CD. If angle BCA=35°, find x and y. (Hint: Join AD.)

Answer 1

AB= 35*2=70
can you continue??

Answer 2

x=110°

Answer 3

I am confused in y

Answer 4

x=110 is right.
y=(AB+BC+CD)/2
do you understand??

Answer 5

why???

Answer 6

it's a rule. angle y is from 'A' to 'D'. so it is half of the AD. ok??