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ABCD is a cyclic quadrilateral. The bise...

ABCD is a cyclic quadrilateral. The bisectors of the angles A, B, C and D. cut the circle at P, Q, R and S respectively. What is `anglePQR + angleRSP` equal to ?

A

`90^@`

B

`135^@`

C

`180^@`

D

`270^@`

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