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JAMB - Mathematics (1994 - No. 44)
In the diagram, PTS is a tangent to the circle TQR at T. Calculate < RTS
120
o
70
o
60
o
40
o
설명
RTS = RQT (angle between a tangent and a chord at the point of contact is equal to the angle in the alternate segment) But R = Q + T = 180
RQT = 180
o
- (50 + 60)
= 180
o
- 110
o
= 70
o
Since RQT = RTS = 70
o
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