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Question

ABCD is a quadrilateral and BD is one of its diagonals as shown in the following figure. Find the area of quadrilateral ABCD.

A
94 square units
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B
12 square units
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C
21 square units
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D
73 square units
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Solution

The correct option is B 12 square units
From the figure it is clear that, CDB=ABD=90
Also, DC=AB=3 units (From figure)
Now, we know that a quadrilateral is a parallelogram if a pair of opposite sides is parallel and is of equal length.
Quadrilateral ABCD is a parallelogram.
Now, area of the ||gm ABCD
=Base×Corresponding altitude
=AB×BD
=3×4 square units
=12 square units

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