A) 18 sq. units
B) \[18\sqrt{2}sq.\]units
C) 18/\[\sqrt{2}\]sq. units
D) None of these
Correct Answer: B
Solution :
\[OA=OB=9,OD=\frac{15}{\sqrt{25}}=3\] Therefore\[AB=2AD=2\sqrt{81-9}=2\sqrt{72}=12\sqrt{2}\] Hence \[\Delta =\frac{1}{2}(3\times 12\sqrt{2})=18\sqrt{2}\] sq. units.You need to login to perform this action.
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