VIDEO #1 -- Surface Area of a Box (rectangular prism)
https://www.khanacademy.org/math/basic-geo/basic-geo-volume-sa/basic-geometry-surface-area/v/surface-area-of-a-box
VIDEO #2 -- Surface Area of Box (rectangular prism) using Nets
https://www.khanacademy.org/math/basic-geo/basic-geo-volume-sa/basic-geometry-surface-area/v/surface-area-of-a-box-using-nets
VIDEO #3 -- Surface Area of Triangular Prism using Nets
https://www.khanacademy.org/math/basic-geo/basic-geo-volume-sa/basic-geometry-surface-area/v/finding-surface-area-using-net