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## anonymous one year ago The rectangular coordinates of a point are given. Find polar coordinates for the point. 1. (4,0) 2.(3,4) 3.(2,-2)

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1. anonymous

Rectangular to polar: $r=\sqrt{x^2+y^2}$ $\theta=\tan^{-1} \frac{ y }{ x }$ Polar to rectangular $x=r \cos \theta$ $y = r \sin \theta$

2. anonymous

I think I got it. Is 1. (4,0) 2. (5,53.1) 3. sqrt8,45) ?

3. anonymous

1 and 2 are good. For 3, (2, -2) is in the 4th quadrant, so the angle would be -45° or one of its coterminal angles.

4. anonymous

alright thanks:)

5. anonymous

you're welcome

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