Question

Solve this problem in brief​

Answer 1

Answer:

x+y=180°

Step-by-step explanation:

x+y=w+z. (given)

x+y+w+z=360°. (complete angle)

x+y+x+y= 360°. (x+y=w+z)

2(x+y). =360°

x+y. =180°

Hence,proved that AOB is a line as <AOB=180°