'In the adjoining figure `A B D C\ a n d\ D A` is perpendicular to `A Bdot` Further

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"In the adjoining figure `A B D C\ a n d\ D A`
is perpendicular to `A Bdot`
Further, `D C=7c m ,\ C B=10 c m\ a n d\ A B=13 c mdot`
Find the area of the quadrilateral `A B C Ddot`"
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