In the diagram above, AO is perpendicular to OB. Find x
Attached Figure / Diagram
A
7.5o
B
15o
C
22.5o
D
30o
E
38.6o
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
4x + 3x + 2x + 90 =360^\circ [angle at a point]
9x + 90 = 360^\circ
9x = 360^\circ - 90^\circ
9x = 270
x = 270/9
x = 30^\circ
Source: Myschool Past Questions Archive (Record #23774)