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In Fig. 6.12, PQ = PR, RS = RQ and ST ||...

In Fig. 6.12, PQ = PR, RS = RQ and `ST || QR`. If the exterior angle RPU is `140°`, then the measure of angle TSR is

A

`55^@`

B

`40^@`

C

`50^@`

D

`45^@`

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