Given the quadrilateral RSTO inscribed in the circle with O as centre. Find the size angle x and given RST = 60o
Attached Figure / Diagram
A
100o
B
140o
C
120o
D
10o
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
If RST = 60o
RXT = 2 × RST
(angle at the centre twice angle at the circumference)
RXT = 2 × 60
= 120o
Source: Myschool Past Questions Archive (Record #46334)