Question

hi . is this thing for real ?

Answer 1

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Answer 2

Well anybody knows really interested in polar coordinates ?

Answer 3

LOL.

Answer 4

we are having party now!

Answer 5

HAHA saif!!

Answer 6

c'mon guys I need to know something about polar coordinates , anybody up for help?

Answer 7

Celebrate Party!

Answer 8

motior asks the question

Answer 9

okay whatever : if anybody is interested answer the following question .

why is the value of " r " in the polar curve r = cos theta is always positive .

Answer 10

because you can't have negative radius

Answer 11

no my question is theta is -ve in 2nd and 3rd quadrant so r must be -ve out there .

Answer 12

a graph of r = cos theta just shows half of the picture

Answer 13

nope, r is magnitude which is never negative

Answer 14

you get nice looking circle r=cos theta

Answer 15

how would you plot r = cos theta

Answer 16

it is circle that starts at y axis

Answer 17

well r = (x^2 + y^2 ) ^0.5 and when r is +ve we only draw its curve but when its -ve we don't care , why ?

Answer 18

hello ???

Answer 19

boom boom anybody ????

Answer 20

oh nvm

Answer 21

how do u find r ? using x and y ofcourse

Answer 22

http://tutorial.math.lamar.edu/Classes/CalcII/PolarCoordinates.aspx

this article turned me mad .

Answer 23

okay whatever thanks for trying me to help , I should ask my teacher

Answer 24

Okay,
when we change from cartesian system to polar system, we make some changes.

In cartesian , we describe a point using (x,y)
for example (-2,1)

when we change it to polar we want it in terms of (r, theta) , r represent distance from origin, theta represent angle from orgin

Using distance formula = r=Sqrt[5]
theta = arctan(1/2)=about 26 degree
since we know it is 180-26=154 degree
(sqrt[5],154 degree)