+0  
 
0
171
1
avatar+54 

What is cos A? Enter your answer as a simplified fraction.

cos A = 

 Mar 22, 2018
edited by jesshobbs  Mar 22, 2018
 #1
avatar+96368 
+2

cos A  =   AC  / AB

 

And  AB  can be found as  √ [ 15^2 + 36^2 ] = √ [ 225 + 1296]  = √1521  = 39

 

So.....cos A  =    15 /39   =   5/13

 

 

cool cool cool

 Mar 22, 2018

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