plshelpmeasmuch plshelpmeasmuch

16-01-2021
Mathematics

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law of cosines
please show your work :)
Will mark as brainlest

law of cosines please show your work Will mark as brainlest class=

Respuesta :

16-01-2021

Answer:

33.9

Step-by-step explanation:

cos rule:

a²=b²+c²-2xaxbxcosA

rearrange:

cosA=(b²+c²-a²)÷(2xaxb)

solve:

cosx=(8²+22²-16²)÷(2x8x22)

cosx=(64+484-256)÷352

cosx=292÷352

cosx=0.830

cos^-1(shift cos)=33.9

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