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    (Original post by anishom)

    The mark scheme says the answer is 47 degrees.

    Thanks.
    What have you tried? Use the fact that angle ABO and ADO are 90 degrees to find the angle BOD first off. The angle OBF is also easy to find.
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    (Original post by anishom)
    can you work through it step by step? I cant understand
    No. What don't you understand? Do you know what a degree is? Do you, by extension, know what 90 degrees is?
 
 
 
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