In given figure, PQL and PRM are tangents to the circle with centre O
at the points Q and R respectively. S is a point on the circle such
that SQL =50o and SRM=60o. Find the value of QSR.
In given figure, O is the centre of the circle.
Therefore, DOQL=DORM =90o
(radius is perpendicular to tangent at the point of contact)
Thus , DQSR = DOSQ+DOSR = 40°+30°=70°
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