PreCalc
posted by Jonathan on .
I posted yesterday and didn't get a response so I'm hoping someone can check these todayThank you they are polar coordinate questionsMy 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)

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. 
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 
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 
thank you

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.