AQA FP3 Polar Co-ordinates Watch

maggiehodgson
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#1
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Can someone please explain what this question is asking

"Find the polar equation of the straight line which is perpendicular to the initial line and at a perpendicular distance a from the pole"

The answer is r = asecTheta but that's not been any clue for me.


What is the diagram that represents this line?
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TeeEm
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it is a "vertical line", ie x=a

rcos θ =a

then

r = ....
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Ilovemaths96
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(Original post by maggiehodgson)
Can someone please explain what this question is asking

"Find the polar equation of the straight line which is perpendicular to the initial line and at a perpendicular distance a from the pole"

The answer is r = asecTheta but that's not been any clue for me.


What is the diagram that represents this line?
think of the equation of a vertical line in cartesian form and then convert to polar if that makes sense
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maggiehodgson
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(Original post by TeeEm)
it is a "vertical line", ie x=a

rcos θ =a

then

r = ....

Ah, so the perpendicular line that is drawn is at a distance a along the x axis. I was reading it as a distance a above O. No wonder I couldn't make any sense out of it.

Thanks.
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TeeEm
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(Original post by maggiehodgson)
Ah, so the perpendicular line that is drawn is at a distance a along the x axis. I was reading it as a distance a above O. No wonder I couldn't make any sense out of it.

Thanks.
no problem
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