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Analytical Geometry

Blazing goIITian

Joined:	21 Dec 2007
Post:	1025

9 May 2008 17:32:54 IST

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523

parabola

None

show that the tangents at the extremities of any focal chord of a parabola intersect at right angles at the directrix

can some one explain me what the question means

what is extremities??????

need not solve the question

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sneha.bagri

Blazing goIITian

Joined: 5 Jan 2007

Posts: 378

9 May 2008 17:37:18 IST

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extrimities mean d point at whoich the focal cord meets d parabola........

BALGANESH

Blazing goIITian

Joined: 21 Dec 2007

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9 May 2008 17:42:15 IST

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ohho
sorry for posting a simple question like this
when i was reading from my pc i got this doubt sorry

ultimator

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Joined: 27 Mar 2008

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9 May 2008 17:42:27 IST

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A chord is a line joining any 2 points on a curve. Its called a focal cord wen it passes thro focus. The tangent to the curve at these 2 points, when drawn n extended, will meet the directrix at rt. angles.

That is, these tangents n the directrix are concurren n the angle between the 2 tangents is a rt angle.

Aatish Pandit

Blazing goIITian

Joined: 3 Feb 2007

Posts: 1200

9 May 2008 17:44:16 IST

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Re:parabola

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