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kpadma
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anandnk
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well I understand the question now. All the vertices of Quadrilateral should lie on the circumference.

I am also modifying my post. An acute rohmbus will not fit in a circle such that all vertices lie on the circumference. Looks like B is the answer But I have a following doubt.

If you make a rectangle very thin then the circle has to have an infinite radius. Limit of width of rectangle -> 0 R -> infinity
Whereas if you make all sides equal and all the angles = 90 degrees then definitely you can draw a circle around it.

I am leaning towards C
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You can always draw a circle that circumscribes a rectangle. Can't you?

I go with B
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gmatblast
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I will go with B as well. Draw any quadrilateral with all the angle = 90. You will always be able to draw a circle through all the vertices.



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