Question

need help picture in comments !

Answer 1

maybe law of cosines?

Answer 2

\[a^2=b^2+c^2-2bc\cos(A)\]
\[a^2=4^2+4^2-2\times 4\times 4\times \frac{\sqrt2}{2}\]

Answer 3

i bet that is one of the choices

Answer 4

would it be a then?

Answer 5

no A has no minus sign

Answer 6

oh so c!!?

Answer 7

as always

Answer 8

ok thanks!