4.Given below is a quadrilateral PQRS in a circle with centre T .What are the measures of and ?
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Step-by-step explanation:
In △TPS and △TRQ
∠PST=∠RQT
∠SPQ=∠QRT
[∵ exterior angle of cyclic quadrilateral is equal to the interior opposite angle]
∠T=∠T (common)
∴△TPS−△TRQ (By AA)
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