JAMB - Mathematics (1988 - No. 43)

In the figure, PQRS is a circle. If chords QR and RS are equal, calculate the value of x

80^o

60^o

45^o

40^o

Explanation

SRT is a straight line, where QRT = 120

SRQ = 180o - 120o = 60o - (angle on a straight line)

also angle QRS = 180o - 100o (angle on a straight line) . In angles where QR = SR and angle SRQ = 60o

x = 100 - 60 = 40o

JAMB - Mathematics (1988 - No. 43)

Explanation

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