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Given right triangle ABC, angle B=28 degrees, and side c=54.8in.  Find side a.

Tiffybean  Nov 18, 2017
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We don't know which angle is the right angle

 

If it's C   we have that 

 

cos 28  =   a / 54.8

 

Multiply both sides by 54.8

 

54.8 cos 28  =  a ≈    48.385

 

If A is the right angle, we have that

 

cos 28  =  54.8 / a  rearrange as

 

a  = 54.8 / cos 28  ≈  62.06

 

 

cool cool cool

CPhill  Nov 18, 2017

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