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In triangle ABC show above, cos B = \(6/10\). What is tan C?

 Jul 9, 2020
 #1
avatar+28021 
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cos = adj/hyp    which means AB = 6       sin c = opp/hyp =  6/10   

 

Tan = opp/adj   =  sin/cos      we either need AC    or   cos c   

we can find AC   via pythagorean theorem

6^2  + AC^2 = 10^2

AC^2 = 64

AC = 8                     so cos c = adj/hyp = 8/10

 

Tan c = sin c /cos c = 6/10  /  8/10  =  6/8

 Jul 9, 2020
 #2
avatar+8352 
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Using the definition:

\(\cos B = \dfrac6{10} = \dfrac{AB}{BC}\)

From this, we can conclude AB = 6.

 

By Pythagorean theorem, AC = 8.

 

\(\tan C = \dfrac{AB}{AC} = \dfrac68 = \boxed{\dfrac34}\)

 Jul 9, 2020

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