Question

I got this problem wrong on my test. Can someone please walk me through it to show me what I did wrong?
Determine two pairs of polar coordinates for the point (5, 5) with 0° ≤ θ < 360°.

Answer 1

These are the steps. If you have questions asked me. My friend posted this question so.....

x² + y² = r²
(5)² + (-5)² = r²
25 + 25 = r²
50 = r²
√50 = r
5√2 = r.

To solve Θ:

y/x = sin Θ / cos Θ
y/x = tan Θ
-5/5 = tan Θ
-1 = tan Θ
Θ = arc tan (-1).
Θ = arc tan (-1) = 315°, and Θ = arc tan (-1) = (315° - 180°) = 135°.

Answer : (5√2, 315°), and (5√2, 135°).

Answer 2

btw I think you wrote your coordinates wrong.

Answer 3

I got the exact same thing as this except it was not the correct answer

Answer 4

what?

Answer 5

http://prntscr.com/41c9ii

Answer 6

I don't understand

Answer 7

are you going with byu?

Answer 8

I had already answered b I am just wondering what i did wrong because my final is next week

Answer 9

BYU?

Answer 10

what is byu

Answer 11

never mind. It's an online course university. I thought you were going with that university...because the question format looked similar.

Answer 12

No I am not sure what it is.. I'm not in university I am in highschool

Answer 13

no I'm in high school too but I'm taking an online course with a university ...

Answer 14

http://openstudy.com/study#/updates/535d68bce4b0977f7a188d99

Answer 15

except the coordinate on that one is negative

Answer 16

only difference is the points are -5,5

Answer 17

which is different but same sol.

Answer 18

the thing I don't understand is -5^2 and 5^2 gets the same solution. 25

Answer 19

Yeah it will get the same solution for the beginning part to find r because (-5)^2=5^2

Answer 20

but it messed up the coordinates for theta

Answer 21

I still think the answer is Answer : (5√2, 315°), and (5√2, 135°).

Answer 22

ur right give me a sec.

Answer 23

@axhleem what do you think?