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JAMB - Mathematics (2017 - No. 13)

Given the quadrilateral RSTO inscribed in the circle with O as centre. Find the size angle x and given RST = 60o
100o
140o
120o
10o

Paaiškinimas

If RST = 60o

RXT = 2 × RST

(angle at the centre twice angle at the circumference)

RXT = 2 × 60

= 120o

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