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Q 3010056819.     A tree AC is broken over by over by wind from B. D is the point where the top of the broken tree touches the ground and BD makes an angle of ` 45^{\circ}` with the ground, if the distance between he base of the tree and the point `D = 10 m`. What is the height of the tree ?

A

`20 m`

B

`10(1+\sqrt{2}) m`

C

` 10\sqrt{2} m`

D

`20\sqrt{2} m`

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