Question

Convert the rectangular coordinates to polar coordinates with r > 0 and 0 < θ < 2π.
(-9, 9)

Answer 1

You can use x= R cos t and y = R sin t

Answer 2

r = 9sqrt(2)

Answer 3

and its some form of 45 degree angle

Answer 4

q2

Answer 5

Find R by: R= sqrt(x^2 + y ^2)

Answer 6

angle = 135

Answer 7

I know how to use the formula, but I can't use decimals as the answer.

Answer 8

I have to put the answer in an x and y format.

Answer 9

(9sqrt(2), 135) or the radian (3pi/4)

Answer 10

how do u get this answer?

Answer 11

been going over spherical and cylindrical coordinates today lol

Answer 12

well; i notice that both ax and y are the same; the only angle with that is a 45 degree; the hyp of a 45 degree is sqrt(2)

Answer 13

r = 9 times bigger than sqrt(2) = 9sqrt(2)

Answer 14

What about this one?

(-√21, -√7)

Answer 15

oh ok

Answer 16

and the x=- and y=+ tells me its in the Q2

Answer 17

r = sqrt(28)

the x=- and y=- is in the Q3

Answer 18

sqrt28?

Answer 19

tan^1(sqrt(7)/sqrt(21)) is the angle

Answer 20

sqrt(21+7) = sqrt(28) right?

Answer 21

yeah, where to u get the 7 from?

Answer 22

or why use the 7

Answer 23

sqrt(7)^2 = 7

Answer 24

7*4 = 28 so...2sqrt(7) = r

Answer 25

tan^-1(sqrt(7)/sqrt(21)) + pi is the angle

Answer 26

we got 30 +pi :)

Answer 27

so the y would be 7pi/6

Answer 28

yes :)

Answer 29

the angle = 7pi/6

Answer 30

(-1, 0)

Answer 31

would it be (sqrt1,0)

Answer 32

thats facing left....

r = 1; theta = pi

Answer 33

why does theta = 0

Answer 34

i mean pi

Answer 35

it 1 from the origin; so r=1

and its 180 or pi from the pos x axis

Answer 36

theta doesnt equal 0, the y coord = 0

Answer 37

the angle = pi

Answer 38

if we turn by pi and move out by 1 we come to -1,0

Answer 39

it's (1,pi)

Answer 40

yes :) 1,pi

Answer 41

ok, a little change in direction.

Answer 42

Convert the equation to polar form.
5x=5y

Answer 43

thats the same as y = x which is

r = t cos(pi/4)

Answer 44

or rather: (r,pi/4) i think

Answer 45

could be +-r, pi/4

Answer 46

whats our options for answers?

Answer 47

pi/4 is wrong, i tried thaat

Answer 48

y=x is a 45 degree line.... cant be another angle :)

Answer 49

x = r cos(pi/4)

y = r sin(pi/4)

Answer 50

i'm so confused right now :(

Answer 51

maybe 5r, but thats rather redundant

Answer 52

5x = 5y right?

5r cos(pi/4) = 5r sin(pi/4)

Answer 53

the 5rs can be removed and you get; cos(pi/4)=sin(pi/4)

Answer 54

is it 5r/sqrt2

Answer 55

dont know; what formats you got to choose from?

Answer 56

i have no idea. what formats are there?

Answer 57

if its multiple choice; then they give you options to choose from....any options to narrow this down with?

Answer 58

no, no multiple choice.

Answer 59

here's another example: x^2+y^2=16

Answer 60

r^2 = 16

Answer 61

that would be 4. I tried that but it says it's wrong.

Answer 62

then i got no idea what your program wants as an answer :)

Answer 63

i got it i had to put it in as r=4

Answer 64

y=2

Answer 65

:)

Answer 66

would it be sqrt2

Answer 67

y=2

r sin(t) = 2

Answer 68

r = 2/sin(t) ?

Answer 69

I don't get it.

Answer 70

the question is Convert the equation to polar form.

y=2