Q9 of 115 Page 8

In Fig. 8.38, AOC is a line, find x.

∠AOB + ∠BOC = 180^o (Linear pair)

70^o + 2x = 180^o

2x = 110^o

x = 55^o

How many pairs of adjacent angles, in all, can you name in Fig. 8.36.

In Fig. 8.37, determine the value of x.

In Fig. 8.39, POS is a line, find x.

In Fig. 8.40, ∠ACB is a line such that ∠DCA = 5x and ∠DCB = 4x. Find the value of x.