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lilsis76
Group Title
graph each point in a polar coordinate system, then convert the given polar coordinate to rectangular coordinates.
(1, pi/8)
this is all my homework is and i have other ones where i have to reverse the coordinates from recangle to polar
 2 years ago
 2 years ago
lilsis76 Group Title
graph each point in a polar coordinate system, then convert the given polar coordinate to rectangular coordinates. (1, pi/8) this is all my homework is and i have other ones where i have to reverse the coordinates from recangle to polar
 2 years ago
 2 years ago

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freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
Polar coords give you $$(r,\theta)$$ so that on the axis you draw something like dw:1351738791260:dw you can then convert that point to an (x,y) rectangular coord. by using trig and making a triangle. $$y=\sin(\theta) \\ x = \cos(\theta) $$
 2 years ago

freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
dw:1351738924218:dw
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
then where does the pi/8 land? i cant find that
 2 years ago

freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
radian notation can be converted as follows: 0pi = 0 degrees pi = 180 degrees 2pi = 360 degrees so pi/8 = 180/8 = 22.5 degrees. first quadrant
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
what the heck?! haha
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
i didnt think about the 180 over 8
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dang it. now im lost :/ i dont know what to do next
 2 years ago

freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
so to get the (x,y) you use (cos(angle), sin(angle)) so for this one \[\bigg(\cos\left(\frac{\pi}{8}\right),\sin\left(\frac{\pi}{8}\right)\bigg)\]
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
so then ....
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
well i guess since x is 1, x will be 1, does that make the y or theta thingy zero ? (0)?
 2 years ago

freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
you need to use your calculator for this. why do you think x is 1?
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dang it, okay its (r, theta) right? okay umm wait. i feel so stupid i dont understand anything im doing
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
well i did the calculaotor thingy u said. cos(pi/8) = the .999 and sin(pi/8)= .007
 2 years ago

freewilly922 Group TitleBest ResponseYou've already chosen the best response.0
your calculator may be in degree mode instead of radians. Try either switching you mode on the calculator or trying cos(180/8) and sin(180/8)
 2 years ago

lilsis76 Group TitleBest ResponseYou've already chosen the best response.0
dang.... :/ the back of the book says the answer is\[\sqrt{2+\sqrt{2}} /2 , \sqrt{2\sqrt{2}} /2\]
 2 years ago
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