Question

question will be attached plz help if you can

thank you!! :)

Answer 1

Law of cosine : \[c^2=a^2+b^2 - 2abcos \theta\]

Answer 2

c =2, a =3, b=4

Answer 3

2^2=3^2+4^2-2(3)(4)cos theta

@P0sitr0n

Answer 4

is it D?

Answer 5

\[\cos \theta =( c^2-a^2-b^2)/-2ab\]\[\cos \theta=\]0.875
answer B as it gives 21

Answer 6

oh ok thank you!