In the diagram, O is the centre. If PQ//RS and ∠ONS = 140^\circ, find the size of ∠POM.
Attached Figure / Diagram
A
40o
B
50o
C
60o
D
80o
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
In the diagram above,
∠MNO = 140^\circ and angles on a straight line is 180^\circ
: ∠NMO = (180 - 140)^\circ = 40^\circ
Hence; ∠POM = 40^\circ ( alternate angle ∠S)
Source: Myschool Past Questions Archive (Record #45754)