Q9 of 115 Page 8

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

Given,

y = 5x

And,

= 4

z = 4x

From figure,

x + y + z = 180^o (Linear pair)

x + 5x + 4x = 80^o

10x = 180^o

x = 18^o

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

In Fig. 8.123, the value of y is

In Fig. 8.125, the value of x is

In Fig. 8.126, which of the following statements must be true?

(i) a + b = d + c

(ii) a + c + e =180°

(iii) b + f = c + e