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Let PQRS be a parallelogram whose diago...

Let PQRS be a parallelogram whose diagonals PR and QS intersect at O. If triangle QRS is an equilateral triangle having a side of length 10 cm, then what is the length of the diagonal PR?

A

`5sqrt(3) cm `

B

`10sqrt(3) cm`

C

`15sqrt(3) cm`

D

`20sqrt(3) cm`

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