aussy123
How to convert polar to cartesian and cartesian to polar.



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diongory
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dw:1366122540329:dw

diongory
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for polar to cartesian think about writing r in terms of x and y, and theta in terms of x and y

aussy123
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I think what you wrote at the top is polar to cartesian. Because your finding x and y. I really need to know how to find cartesian to polar.

diongory
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dw:1366123054027:dw

aussy123
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I think so Im given something like that with this tan^1

diongory
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i know what the answer is. I'm trying to help you get there yourself. Work out those two equations i drew for you.

aussy123
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\[\sqrt{x^2+y^2}=r\]

diongory
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excellent!

aussy123
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\[x+y=r\]

diongory
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no. not so good.dw:1366123658835:dw

diongory
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your first solution was correct

diongory
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dw:1366123719654:dw

aussy123
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oh sorry

diongory
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what about for theta?

aussy123
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would it be \[\frac{ \sqrt{x} }{ \sqrt{y} }\]

diongory
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how did you get that?

aussy123
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theta = tan^1 (y/x)

diongory
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great. well done. that is it. you have finished.

aussy123
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thank you

diongory
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dw:1366124051396:dw