This is an easy question. Find co-ordinate values of A,B,C,D,E.
Then find Area of triangle ODC which is a right angled triangle. So, area(ODC)=(OD*OC)/2.
Then find Area of triangle DBE which is again a right angled triangle. So, area(DBE)=(BE*DE)/2.
Therefore Area of quadrilateral OCEB is area(DBE)-area(ODC).
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