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

Assessment: JAMB UTME - Mathematics - 1988 Subject: General Mathematics

Question 1 Report

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

Answer Details
SRT is a straight line, where QRT = 120

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

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

x = 100 - 60 = 40

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