+0  
 
+1
212
1
avatar+117 

What is the length of AB¯¯¯¯¯?

Enter your answer as a decimal in the box. Round only your final answer to the nearest tenth.

 

oscar.a1551  May 17, 2018
 #1
avatar+87293 
+2

We can use the Law of Cosines, here

 

AB^2  = 18^2 + 12^2  - 2 (18)(12)cos(79)

 

AB^2   = 324 + 144 - 432*cos(79)

 

AB^2  = 468 - 432*cos(79)

 

AB  = √ [ 468 - 432*cos(79) ]  ≈   19.6

 

 

cool cool cool

CPhill  May 17, 2018

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