Surface Area

Calculate the Surface Area of a Cube

To calculate the surface are of a cube, find the surface area of one side and multiply by 6. The surface area of any side is the length of a side squared.

Example: Surface area of a cube with a side of length 4 = 4*4*6 = 96

Surface Area of Rectangular Prisms

A rectangular prism has 2 ends and 4 sides. Opposite sides have the same area. The surface area is the sum of the areas of all six sides.

How to find the surface area of Rectangular Prisms:

• Find the area of two sides (Length*Height)*2 sides
• Find the area of adjacent sides (Width*Height)*2 sides
• Find the area of ends (Length*Width)*2 ends
• Add the three areas together to find the surface area
• Example: The surface area of a rectangular prism 5 cm long, 3 cm. wide and 2 cm. high = 5*2*2 + 3*2*2 + 5*3*2 = 20 + 12 + 30 = 62 cm².