Q1 of 115 Page 8

In Fig 8.56, lines l1 and l2 intersect at O, forming angles as shown in the figure. If x = 45, find the values of y, z and u.

Given that,

x = 45o


y =?


z =?


u =?


z = x = 45o (Vertically opposite angle)


z + u = 180o (Linear pair)


45o = 180o – u


u = 135o


x + y = 180o (Linear pair)


45o = 180o – y


y = 135o


Therefore, x = 45o, y = 135o, u = 135o and z = 45o.


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