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For the first one, is it 10 or 5?

RainbowPanda  Feb 28, 2018
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 #1
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+2

Cos T   has  the same value  as  Cos P  =  10/15  = 2/3

 

So

 

Cos T   =  2/3  =  6/x

 

Cross-multiply

 

2x   = 3 * 6

 

2x  =  18     divide both sides by 2

 

x  =  9   

 

 

Remember that   sin (x)  =  cos (90 - x)

 

So

 

sin (23)  =  cos (90 - 23)  =  cos (67)    ....so  x    =   67°

 

 

 

cool cool cool

CPhill  Feb 28, 2018

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