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TN XII Math
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Objective type Questions and Answers
The length of the latus rectum of the parabola whose vertex is $(2 ,-3)$ and the directrix $ x=4 $ is
\[\begin {array}{1 1}(1)2&(2)4\\(3)6&(4)8\end{array}\]
tnstate
class12
bookproblem
p274
objective
q90
modelpaper
oct-2009
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asked
May 13, 2013
by
poojasapani_1
edited
May 15, 2014
by
meena.p
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1 Answer
Vertex is (2,-3)
Equation of the directrix $x=4$
a= distance of the directrix from the vertex
a= x- distance of the directrix from the vertex.
$a=4-2=2$
=> $4a=8$
Hence 4 is the correct answer.
answered
May 15, 2014
by
meena.p
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