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Bbambino1976
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express sin 205degrees in terms of the sine of a positive acute angle. Do not evaluate.
 11 months ago
 11 months ago
Bbambino1976 Group Title
express sin 205degrees in terms of the sine of a positive acute angle. Do not evaluate.
 11 months ago
 11 months ago

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Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
an airplane propeler blade is 2.80ft, and rotates @ 2200 r/min. What is the linear velocity of a point on the tip of the blade?
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
have you learned about special trig rules with trig functions?
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
please explain?????????????????????????
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
would i have learned about this in geomiyt/?
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
ok I'm sure now, for sin(205) to have it be an acute angle it has to be less than 90, and sin(25) works and is positive
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
Then your propeller one is difficult to explain, I found the same problem that is explained here on page 16 http://www.nunamaker.com/mathlady/Math%20181%20Chapter%2010%20Trig%20Functions%20Term%200306.pdf
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
Let me explain this and please tell me if I got it or not?
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
sin is positive in qued 1 or 2, so u subtract from 205 untill u get to 180? hence the 25.
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
um well not quite. So first info is given that the angle needs to be acute. And an acute angle must be less than 90 degrees, and this is taught in geometry. So by that definition, you know you are looking for an angle in the first quadrant. Second, it tells you need sin that is equivalent to sin(205) so hopefully with this picture it will help
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
dw:1383427677574:dw
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
so by using those rules 1. acute is less than 90 degrees 2. sin must be positive 3. the angle you are looking for has paired angle. you find the angle by 205180 because you are looking for an angle that is exactly half around the unit circle which is 360 degrees
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
so the acute angles of A & B have the same degree measurement?
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
yup, only difference is one is negative and the other positive. if you have a calculator you can show yourself they are the same too. sin(205)=sin(25)
 11 months ago

Bbambino1976 Group TitleBest ResponseYou've already chosen the best response.0
cool learning is fun! when i put sin(25) in my calculator i get 0.422.
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
haha sure is, and ye, the point of me telling you to try your calculator was to see that the decimal answer you get for sin(205) is the same as sin(25) just one is + and the other 
 11 months ago

Jbo11 Group TitleBest ResponseYou've already chosen the best response.0
so sin (205) should be 0.422
 11 months ago
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