If \( A \) and \( B \) are two points on the line \( 3 x+4 y+15=0 \) such that \( O A=O B=9 \) u...

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If \( A \) and \( B \) are two points on the line \( 3 x+4 y+15=0 \) such that \( O A=O B=9 \) units, then the area of the triangle \( O A B \) is
(a) 18 sq. units
(b) \( 18 \sqrt{2} \) sq. units
(c) \( 9 \sqrt{2} \) sq. units
(d) \( 18 \sqrt{3} \) sq. units
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