Homework Help: Math

Posted by Jon on Wednesday, April 22, 2009 at 4:08pm.

Find the coordinates of the point whose polar coordinates are (20,140degrees).

r=20
0=140
x=r cos (o)
y=r sin (o)
x=20 cos (140)
y=20 sin (140)
x=20 (-0.7660)= -15.32
y=20 (0.6427)= 12.85

(-15.32, 12.86)
on my answer on my paper, I left off the - and the ) at the end. She pointed at the ( at the beginning but she didn't add the negative sign for 15.32 so I'm confused on whether I got it wrong just because I left off the parenthesis at the end or the answer isn't (-15.32, 12.86)

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