In the diagram above, what is the size of angle ACB?
Attached Figure / Diagram
A
40o
B
50o
C
60o
D
80o
E
100o
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
< ABC = 80^\circ (alternate angles)
< ACB = 180^\circ - (80^\circ + 40^\circ) = 60^\circ
Source: Myschool Past Questions Archive (Record #22404)