Question -
Answer -
(∠BOD,z); (∠DOF, y) are pair of vertically opposite angles.
So, ∠BOD = z= 900
∠DOF = y= 500
[Vertically oppositeangles are equal.]
Now, x + y + z = 180 [Linear pair] [AB is a straight line]
x + y + z = 180
x + 50 + 90 = 180
x = 180 – 140
x = 40
Hence values of x, y, z and u are 400, 500,900 and 400 respectively.