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babydoll332
 2 years ago
Evaluate sec 240° without using a calculator by using ratios in a reference triangle.
babydoll332
 2 years ago
Evaluate sec 240° without using a calculator by using ratios in a reference triangle.

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butterflyprincess
 2 years ago
Best ResponseYou've already chosen the best response.0unit circle??

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1ok, u know what is cos 60 ?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1lol! 60=pi/3 cos 60 = 0.5 ok ?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1sec 240 = 1/ cos 240 cos 240 = cos (180+60) cos (180+x) = cos x now try

babydoll332
 2 years ago
Best ResponseYou've already chosen the best response.0what should i try im a lilttle confused

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1cos (180+x) = cos x so cos 240 = cos 60 = 0.5 got this ?

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1now sec 240 =1/ cos 240 = 1/(0.5) = 2 ok ?

babydoll332
 2 years ago
Best ResponseYou've already chosen the best response.0why did u use cos 60 though?

ByteMe
 2 years ago
Best ResponseYou've already chosen the best response.060 degrees is the reference angle for 240 degrees

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1because cos 60 is known 60 is standard angle in unit circle
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