Surface area
First, I explain the concept of surface area and net using a cube. Then we calculate the surface area of a cube with edge length 2 cm. Lastly, I show how to find the surface area of a rectangular prism (box) when its dimensions are given.
In the second video, I show how to calculate the surface area of a square pyramid. It's easy, really... you just add the areas of the different faces together. In the last problem, we're given the volume of a cube and need to find the surface area.
See also
Area of parallelograms and triangles
Math Mammoth Geometry 2 — a self-teaching worktext with explanations & exercises (grades 6-7)
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