rectangular coordinates: (6, -8)

ok i got r=10 which im pretty sure is right but im unsure about q.

q=tan-1(y/x)

so i got q= -53.13)

but i checked it on a conversion thing and it said q is like 307??? what did i do wrong

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- May 25th 2009, 08:03 PMtomatoesconverting rectangular coordinates to polar
rectangular coordinates: (6, -8)

ok i got r=10 which im pretty sure is right but im unsure about q.

q=tan-1(y/x)

so i got q= -53.13)

but i checked it on a conversion thing and it said q is like 307??? what did i do wrong - May 25th 2009, 10:09 PMGrandadPolar coordinates
Hello tomatoesYour answer is OK, but if you need to give an angle between and , then you'll need to subtract from , which is where the comes from.

There are two values of in the range for which . They are (to the nearest degree) and . Since is in the fourth quadrant, the answer you want is .

Grandad