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In the adjoining figure , the diagonals ...

In the adjoining figure , the diagonals of the cyxlic quadrilateral PQRS intersect each other at the point X in such a way that `anglePRS=65^(@) andangleROS=45^(@)`. Find the values of `angleSQP and angleRSP` .

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Two angles in circle produced by the arc PS are ` anglePRSandanglePQS` .
`thereforeanglePQS=anglePRS=65^(@)thereforeangleSQP=65^(@)`
Again , two angles in circle produced by the arc RS are `angleRQSandangleRPS`
`thereforeangleRQS=angleRPSrArrangleRPS=45^(@)[becauseangleRQS=45^(@)]`
Then in `DeltaPRS,angleRSP+anglePRS+angleRPS=180^(@)`
or, `angleRSP^(@)+65^(@)+45^(@)=180^(@)[becauseangleRPS=45^(@)]`
or, `angleRSP=180^(@)-110^(@)=70^(@)`
`thereforeangleSQP=65^(@)andangleRSP=70^(@)`
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CALCUTTA BOOK HOUSE-THEOREMS RELATED TO CYCLIC QUADRILATERAL -Example (Long-answer type questions)
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  7. In traangle ABC , AB =AC and E is any point on the extended BC . If th...

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  8. ABCD is a cyclic quadrilateral .The chord DE is the external bisector ...

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  9. BE and CF are perpendicular on sides AC and AB of triangles ABC respec...

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  10. ABCD is parallelogram A circle passing through the points A and B inte...

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  11. ABCD is a cyclic quadrilateral. The two sides AB and CD are produced t...

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  12. O is the orthocentre of the DeltaABC . Prove that O is also the incen...

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  13. ABCD is a cyclic quadrilateral such that AC bisects angleBAD . AD is ...

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  14. In two circles , one circle passes through the centre O of the other c...

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  15. Prove that cyclic paralleloram must be a retangle.

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  16. Prove that any four vertices of regular pentagon are concyclic .

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  17. ABCD is a cyclic quadrilateral. The side BC of it is extended to E . ...

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  18. AB is a diameter of a circle. PQ is such a chord of the circle that it...

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  19. ABCD is a cyclic quarilateral. The bisectors of angleaandangleC in ter...

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  20. DeltaABC is an acute angle triangle inscribed in a circle in a circle ...

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