In the diagram if PQRS is a square of si...

In the diagram if PQRS is a square of side 3 cm and `angle PTS` = `60^@`. Then the length of TR approximately is.

A

`3 - sqrt 3 m`

B

`1 - sqrt 3 m`

C

`3 + sqrt 3 m`

D

`1 + sqrt 3 m`

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