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A hall has a square floor of dimension 1...

A hall has a square floor of dimension 10m `xx`10 m (see the figure) and vertical walls. If the angle GPH between the diagonals AG and BH is `cos^(-1) (1/5),` then the height of th e hall (in meters) is :

A

`5sqrt3`

B

5

C

`2sqrt10`

D

`5sqrt2`

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