Question

Help explain solve……

Answer 1

cosA=b^2+c^2-a^2/2xbxc

58.8^2+38.4^2-71.4^2/2x58.8x38.4=-461/12544

cos^-1 (because finding angle)

cos^1(-461/12544)=92.10613071

Answer 2

About 92.1 °

Explanation:

`cos(U)=(58.8^(2) +38.4^(2) -71.4^(2) )/2(58.8)(38.4)\\`

`cos(U)= (3457.44+1474.56-5097.96)/4515.84`

`cos(U)= (-165.96)/4515.84`

`cos(U)= -0.03675063775`

`U= cos^(-1) (-0.03675)`

`U=92.1`