+0  
 
+2
301
1
avatar+221 

What is the length of JK¯¯¯¯¯, to the nearest tenth of a millimeter?


4.5 mm

5.6 mm

8.3 mm

19.9 mm
 

 

 

https://prntscr.com/j3hfwg

 

 

 

 

 

http://prntscr.com/j3hfwg

quilly  Apr 10, 2018
 #1
avatar+92367 
+2

We can use the Law of Cosines, here

 

JK   =  sqrt [ 3^2 + 5^2 - 2(3)(5)cos (62) ] 

 

JK =  sqrt  [ 34 - 30cos(62) ] ≈ 4.46 mm  ≈  4.5 mm 

 

 

cool cool cool

CPhill  Apr 10, 2018

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