Question

in the figure 'O' is the centre of the circle and angle POR=120 find angle PQR and angle PSR

Answer 1

if there is figure like tis...remember that the central angle is the double of the upper angle..so if POR is 120. then PQR must be 60...

So PQR = 60°

PSR and PQR are supplementry
So PSR = 180 - PQR

PSR = 120°

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Answer 2

angle PQR=anglePOR/2=120/2=60o
angle pqr+anglepsr=180o
anglePSR=180-anglePQR
=180-60=60o
angle PSR=120o