This is a sizing question, please direct what formula to use for this. High-definition (HD) televisions today have a 16:9 aspect ratio (width to height). The advertised screen size is equal to the screen diagonal.

Allowing for 2 inches of Styrofoam padding on all sides of the TV, what is the smallest possible length and width of a shipping box for a 75-inch HD TV?

Possible response should be

64 by 36

68 by 40

75 by 44

or

60 by 45