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https://prnt.sc/qpagnb

 Jan 17, 2020
 #1
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Hypotenuse (from pythag theorem) = sqrt 80

 

Tan A = opp/adj =  4/8 = 1/2

 

Sec a = 1/cos a =   1 /(adj/hyp) = hyp/adj = sqrt 80 / 8 =   4 sqrt 5  / 8 == sqrt5 / 2

 

sin a = opp/hyp =4/sqrt80    1/sqrt 5  = sqrt5/ 5 

 Jan 17, 2020

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