# In Fig. 9.44, x + y =A. 270B. 230C. 210D. 190°

By exterior angle theorem,

In

OCA + AOC = x

x = 80o + 40o

= 120o

AOC = DOB (Vertically opposite angle)

DOB = 40o

By exterior angle theorem,

In

y = BOD + ODB

= 40o + 70o

= 110o

Now, x + y = 230o

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