Law of Cosine Review Final by Makayla Tessnear https://padlet.com/mbarri6302/ddehe65868p25gar en-us 2021-05-19 14:19:38 UTC 2026-01-19 10:06:37 UTC hello@padlet.com The Law of Cosine mbarri6302 https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540102091 The Law of Cosine is used to find either a angle or a side of a triangle when unable to use Law of Sines.
The equations for Law of Cosine are:
c²=a²+b²-2abCosC
b²=a²+c²-2acCosB
a²=b²+c²-2bcCosA]]> 2021-05-19 15:35:12 UTC https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540102091 Example #1 mbarri6302 https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540172131 Find B
a=24 b=40 c=18
Make list 
A=   a= 24
B=  b=40
C=  c=18
Next look for biggest side/angle 
40²= 24²+18²-2(24)(18)CosB
1600=900-864CosB
700=-864CosB
-0.810=CosB
144.114 degrees=B


]]> 2021-05-19 15:48:48 UTC https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540172131 Example #2 illustration mbarri6302 https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540216276 2021-05-19 15:57:47 UTC https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540216276 Example Video mbarri6302 https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540320252 https://drive.google.com/file/d/1iVsDssTYpN9KzW5qOZVAuk7B0bohNYFS/view]]> 2021-05-19 16:18:49 UTC https://padlet.com/mbarri6302/ddehe65868p25gar/wish/1540320252