To get the area of the top and bottom = 2(Length x Width)
To get the area of the front and back = 2(Height x Length)
To get the area of the sides = 2(Height x Width)
To get the surface area = 2(LxW) + 2(HxL) + 2(HxW)
This formula also works with a cube but instead of multiplying by 2 all the time, since all the sides are the same, you can just multiply it by 6 to get the surface area.
Then we learned about Volume, volume is the measurement of the inside of the recangular prism or the cube.
Volume has a very simple formula,
This formula can also be used on a Rectangular prism. Another formula for volume is (Base x Height) but the base of a rectangular prism and a cube is LxW which the same formula.