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Evaluate sec 240° without using a calculator by using ratios in a reference triangle.
 one year ago
 one year ago
Evaluate sec 240° without using a calculator by using ratios in a reference triangle.
 one year ago
 one year ago

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butterflyprincessBest ResponseYou've already chosen the best response.0
unit circle??
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
ok, u know what is cos 60 ?
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
lol! 60=pi/3 cos 60 = 0.5 ok ?
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
sec 240 = 1/ cos 240 cos 240 = cos (180+60) cos (180+x) = cos x now try
 one year ago

babydoll332Best ResponseYou've already chosen the best response.0
what should i try im a lilttle confused
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
cos (180+x) = cos x so cos 240 = cos 60 = 0.5 got this ?
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
now sec 240 =1/ cos 240 = 1/(0.5) = 2 ok ?
 one year ago

babydoll332Best ResponseYou've already chosen the best response.0
why did u use cos 60 though?
 one year ago

ByteMeBest ResponseYou've already chosen the best response.0
60 degrees is the reference angle for 240 degrees
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
because cos 60 is known 60 is standard angle in unit circle
 one year ago
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