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Latus Rectum

If the vertex...

Question

If the vertex of a parabola be at origin and directrix be x+5 = 0 , then its latus rectum is

A

5

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B

10

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C

20

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D

40

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Solution

The correct option is C
20

Distance between vertex and directrix = a = 5 units.
Therefore , latus rectum = 4a = 20

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