Given the quadrilateral RSTO inscribed in the circle with O as centre. Find the size angle x and given RST = 60o
A.
100o
B.
140o
C.
120o
D.
10o
Correct answer is C
If RST = 60o
RXT = 2 × RST
(angle at the centre twice angle at the circumference)
RXT = 2 × 60
= 120o