Q.
A line forms a triangle of area 543 sq-units with the coordinate axes. If the perpendicular drawn from the origin to the line makes an angle of 60° with the x-axis, then the equation the line is
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a
3x+y=18
b
x+3y=9
c
x+3y=18
d
none of these
answer is C.
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Detailed Solution
Let p be the length of the perpendicular drawn from the origin to the required line. The perpendicular makes an angle of 60° with the x-axis. Putting a= 60° in xcosα+ysinα=p the equation of the line is xcos60∘+ysin60∘=por, x+3y=2p.This cuts the coordinate axes at A(2p,0) and B0,2p3It is given that Area of △OAB=543 sq. units.⇒ 12(OA)(OB)=543⇒ 12×2p×2p3=543⇒p2=81⇒p=9Hence, the equation of the line is x+3y=18
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