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maths Q

This is the maths question that i don't know how to do......

 

In the figure, ABC is an equilateral triangle and BCDE is a square of side 1 cm. It is given that BF=1 cm and BD is √2 cm and angle DBF =y degree.

 

Pls help. Thx..

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Uploaded on June 25, 2010
Taken on June 25, 2010