Question 1080058: May I have someone else help me with this question. The last tutor only said "Use your calculator."
Thank you
Make a table of ordered pairs using values of θ that are multiples of 45°.
r = 8 cos θ
0°=
45°=
90°=
135°=
180°=
225°=
270°=
315°=
Found 3 solutions by Boreal, josgarithmetic, rapture:
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! cos 0=1, so r=8
cos 45 is sqrt(2)/2, so r is 4 sqrt (2)
cos 90=0, so r is 0
cos 135 is - sqrt(2)/2, so r is -4 sqrt(2)
cos 180 is -1, so r=-8
cos 225 is -sqrt (2)/s, so r is -4 sqrt(2)
cos 270 is 0, so r is 0
cos 315 is sqrt(2)/2, so r is 4 sqrt (2)
Answer by josgarithmetic(39617)  (Show Source):
You can put this solution on YOUR website! Refer to the Unit Circle to get the reference values for cosine of each of your angles. From those, use simple computation for  , or use a calculator if you want decimalized values.
You should be able to refer to  , etc...
Answer by rapture(86)  (Show Source):
You can put this solution on YOUR website! All you have to do is replace θ with the given values.
I will do the first one only.
r = 8 cos θ
Let θ = 0°
r = 8 cos(0°)
You know that cos(0°) = 1.
r = 8(1)
r = 8
Did you follow?
Do the same for the other values.
If you do not know the cosine value for the other degrees given, plug each into a
scientific calculator or use the wolfram website or mathway.com to find the rest.
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