Is it an extraneous solution if the numbers are not real but both sides are equal when you plug the number back in?
ie. square root of -1 = square root of -1

would the solution that was plugged in to get that be extraneous?

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by