Find radius if a circle is inscribed in quadrilateral

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amitdixit
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you need to show some work before we can help.

To give you a hint the answer it isn't a) since the diameter would be 22cm but DC is 25cm do you see why?

Next hint is that br=bq and lines that are tangent to the circle are perpendicular to the radius drawn there so you can construct some intermediate triangles and test the other possible answers.
 

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