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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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