Question

please answer this 28th question

Answer 1

Step-by-step explanation:

ray Bo is the bisector of angle CBE

therefore angle CBois equal to half of angle c b e

1/2(180-y)

90-y/2

similarly ray co is the bisector of angle bcd

angle bco=1/2anglebcd

1/2(180-z)

90-z/2

after that add first equation and second equation

after that you will get your answer