Q8 of 115 Page 8

In Fig. 8.123, the value of y is

3x + y + 2x = 180^o (Linear pair)

5x + y = 180^o (i)

From figure,

y = x (Vertically opposite angles)

Using it in (i), we get

5x + x = 180^o

6x = 180^o

x = 30^o

Thus,

Y = x = 30^o

Given ∠POR = 3x and ∠QOR =2x+10°. If ∠POQ is a straight line, then the value of x is

In Fig. 8.122, AOB is a straight line. If ∠AOC +∠BOD = 85°, then ∠COD =

In Fig. 8.124, if = 5 and = 4, then the value of x is

In Fig. 8.125, the value of x is