Posted by **Jonathan** on Wednesday, September 28, 2011 at 9:18am.

I posted yesterday and didn't get a response so I'm hoping someone can check these today-Thank you they are polar coordinate questions--My answers are her I just need them checked-

1.Which of the folowing is another representation of (-3,pi)?

(3,120degree)

(3,0 degree)I think it is this one??

((-3,0 degree)

2.Which is not a representation of (5,150 degree)

(-5,-30 degree)I think it is this one?

(-5,330 degree)

(5,510 degree)

3.Give 3 representations of (3,240 degree)One has to be in radians

My choices are: (3,600 degrees)

(3,-120 degree degree)

(-3,pi/3)

4.Give 3 representations of (-6,3pi/4)one has to be radians

I gave-(-6,495 degrees)

(-6,-225 degrees)

(6,-pi/4)

- Pre-Calc -
**bobpursley**, Wednesday, September 28, 2011 at 10:05am
1 correct

2 Normally we avoid negative angles, but if one allows them, then all the answers represent 5,150

3. Ok, except are you allowing negative angles?

4. ok

Question 2 bothers me as a bad question.

- Pre-Calc -
**Reiny**, Wednesday, September 28, 2011 at 10:08am
I agree with the first three

for the last one, since the angle in the original is in radians, you should stay with radians

so (-6,11π/4) --- your first one

(-6, -5π/4) --- your 2nd

- Pre-Calcbob pursley please recheck -
**Johnathan**, Wednesday, September 28, 2011 at 10:10am
In #2 it was which one is NOT a representation , that's why I thought (-5,-30) I can't have all of them just the one that is NOT a representation

Thank you

- Pre-Calc -
**Johnathan**, Wednesday, September 28, 2011 at 10:12am
thank you

- Pre-Calc -
**bobpursley**, Wednesday, September 28, 2011 at 10:14am
I made myself clear. Just why do you think -5@-30 does not produce a ray at 5@150? The negative on the five says, add 180 to the angle.

Maybe I am missing something. Most math teachers would agree with Reiny on 4, I am an engineer, so I live in many alternative languages on math. I also speak negative angles.

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