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Find the length AC, to two decimal places.
I got 3.21. Why is this wrong? Thank you!

 Oct 4, 2020
 #1
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Does AC look like it is only .21 longer than AB ?

 

Cosine rule

AC^2 = 3^2 + 7^2 - 2 (3)(7)cos 50=.......

 Oct 4, 2020
 #2
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16.71 is still wrong?

Noori  Oct 4, 2020
 #3
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AC^2 = 3^2 + 7^2 - 2 (3)(7)cos 50= 31.00  

     AC = sqrt 31 =5.568

 Oct 5, 2020
 #4
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Thank you!

Noori  Oct 5, 2020

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