Back again! For some reason, these remind me of related rates =P

1) What is the smallest perimeter and dimensions of a rectangle whose area is 16 inches squared?

(I know the answer is 16 and 4x4, I just don't know how to do it)

Also, what is "Snell's Law"? It seems like we're using it in many problems, but because my teacher doesn't actually teach anything, I don't understand it

Thanks!