Question

Find the polar coordinates that do not describe the point in the given graph.

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Answer 1

what is the question? Did you guess ?

Answer 2

I didn't mean to select that answer. I am not entirely sure what to do.

Answer 3

I do know that the exact coordinate is (2, 30 degrees) by looking at the graph.

Answer 4

Well, that is one of the coordinates..

Answer 5

yes, and if we add 360 degrees to the angle 30, that would be the same spot.

and, (a bit more tricky),
if we add 180 degrees (to get 210), then set the radius to -2
that is also the same point.

The "normal way" is stand at (0,0) with your feet lined up pointing to the right on the x-axis. Then turn 30 degrees counter clock wise. Then take two steps forward.

The "backwards way" is start the same way, then turn 210 degrees counter clockwise, then take two steps "backward". You will be in the same spot as doing (2, 30)

Answer 6

oh

Answer 7

also, (-2, -150)
means turn 150 degrees *clockwise*
you end up with your nose pointing along the 210 degree line.
then -2 means walk backwards 2 steps.
yet again, you are at the same spot

the first choice , turn 30 then walk backwards 2 steps is a different spot.

Answer 8

I just found out from a friend, that if both r and theta is negative, then you rotate it 180 degrees, right?

Answer 9

oh

Answer 10

I just posted about the -150

the negative means you turn clockwise (which is not the usual direction)
I find it easier to puzzle out by actually standing in the middle of the room and doing the turns. It sinks in faster.

Answer 11

Oh.