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pls help

 Nov 17, 2018
 #1
avatar+107656 
+1

1  Here, AB is the hypotenuse and BC is the opposite side

So....the trig function that relates  opp/hyp   =  cosine

 

So

 

cos (22°)  =  BC / 18     multiply both sides by 18

 

18 *cos (22°)  = BC ≈  16.7

 

P.S.  -  drawing a picture might help you with these, Cerenetie

 

cool cool cool

 Nov 17, 2018
 #2
avatar+107656 
+2

We know the side adjacent to the angle  = 6

And we are looking for the hypotenuse = board length

The trig function that relates the adjacent and hypotenuse is the cosine

 

So

 

cos (55°)  =  6 / hyp      rearrange as

 

hyp   =   6 / cos (55°)  ≈ 10.5 ft

 

 

 

cool cool cool

 Nov 17, 2018

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