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Question 133
The breadth of a rectangular field is 9 metre. Its diagonal is 15 metre long. What will be the area of the rectangular field ?
Solution
Let length and breadth of rectangle be 'l' and 'b' respectively.
b = 9 m.
Diagonal = $$\sqrt{l^{2}+b^{2}}$$.
$$15=\sqrt{l^{2}+b^{2}}$$.
$${l}=\sqrt{15^{2}-9^{2}}$$.
$$l=12$$.
Area of rectangle = $$l\times{b}$$.
=$$12\times9$$.
=$$108$$sq.m.
Hence, Option B is correct.
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