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Board 8 > Someone help me do my sister's math homework for reasons too stupid to explain.

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09/22/20 7:36:03 PM
#1:


It's precalc. I've done most of it, but I ran into a problem with a very basic question.
Convert the polar coordinates (20, 11pi/6) into rectangular coordinates
The answer listed in the book is (10rad2, -10). My problem is that my answer comes down to (10rad3, -10). I have no idea where they could be getting a rad2. I know that the X coordinate is rcos(theta), which is fine, and I know that just means 20cos(11pi/6), which translates to 20*(rad3/2), which turns into 10rad3. Am I making some incredibly stupid error here, or is this a misprint?

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09/22/20 7:44:35 PM
#2:


Anagram posted...
Am I making some incredibly stupid error here
You mean doing your sister's homework?

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tyder21
09/22/20 7:45:02 PM
#3:


Pretty sure you're right.

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red sox 777
09/22/20 7:47:14 PM
#4:


Why are you doing your sister's homework?

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pjbasis
09/22/20 7:48:30 PM
#5:


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Ashethan
09/22/20 7:53:15 PM
#6:


My daughter's taking pre-calc this year. This stuff goes so far over my head, I couldn't tell you. I'd ask her but then I'd have trouble explaining it.

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pyresword
09/22/20 7:57:22 PM
#7:


It's a misprint. Your answer is right
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kevwaffles
09/22/20 7:57:52 PM
#8:


The book is indeed wrong.

https://www.emathhelp.net/calculators/calculus-2/polar-rectangular-coordinates-calculator/?type=r&x=20&y=11pi%2F6&steps=on

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09/22/20 8:08:38 PM
#9:


Thanks, everyone. Good to be vindicated.

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