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Given the quadrilateral RSTO inscribed in the circle with O as centre. Find the size ...



Given the quadrilateral RSTO inscribed in the circle with O as centre. Find the size angle x and given RST = 60o
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  • A 100o
  • B 140o
  • C 120o
  • D 10o
Correct Answer: Option C
Explanation:
If RST = 60o

RXT = 2 × RST

(angle at the centre twice angle at the circumference)

RXT = 2 × 60

= 120o

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