JAMB - Mathematics (2017 - No. 13)
100o
140o
120o
10o
คำอธิบาย
If RST = 60o
RXT = 2 × RST
(angle at the centre twice angle at the circumference)
RXT = 2 × 60
= 120o
RXT = 2 × RST
(angle at the centre twice angle at the circumference)
RXT = 2 × 60
= 120o