Calculate the value of x in the diagram above
Attached Figure / Diagram
A
18o
B
30o
C
40o
D
60o
E
15°
Verified Correct Answer: E.
Step-by-Step Mathematical Solution
vertically opposite angles are equal, hence
3x + 6x + 3x = 180^\circ
12x = 180^\circ
x = 15^\circ
Source: Myschool Past Questions Archive (Record #22051)