+0  
 
+5
172
4
avatar+31 

 I hate this

waxy123  Mar 5, 2017

Best Answer 

 #3
avatar+31 
+5

Thank you so much 

waxy123  Mar 5, 2017
 #1
avatar+87333 
+5

20. Using the Law of Cosines, we have

 

13^2 = 10^2 + 8^2  - 2(10)(8)cos(K)

 

5 =   -160 cos (K)     divide by - 160

 

-1/32  = cos(K)

 

arccos (-1/32) = K  ≈ 91.8°

 

 

cool cool cool

CPhill  Mar 5, 2017
 #2
avatar+87333 
+5

21. Using the Law of Sines, we have

 

sin A / 8  = sin (120)/ 10

 

sin A  = (8/10)sqrt(3)/2

 

sinA  = .4sqrt(3)

 

arcsin(.4sqrt(3))  = A  

 

So m< C  = 180 - B - A  =  180 - 120 - arcsin(.4sqrt(3)) ≈ 16.1°

 

 

cool cool cool

CPhill  Mar 5, 2017
 #3
avatar+31 
+5
Best Answer

Thank you so much 

waxy123  Mar 5, 2017
 #4
avatar
+5

have no idea what that guy is talking aboutwink

Guest Mar 5, 2017

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