Lesson 11 surface area review
Identified the number of edges and the prism
The number of edges of a prism can be determined by adding together the number of edges of its two bases and the number of edges connecting corresponding vertices on the bases.
For example, a rectangular prism has 12 edges. This is because it has 4 edges on the top base, 4 edges on the bottom base, and 4 vertical edges connecting the corresponding vertices on the top and bottom bases.
To calculate the surface area of a prism, you need to find the area of all its faces and add them together. The formula for the surface area of a rectangular prism is 2lw + 2lh + 2wh, where l is the length, w is the width, and h is the height.
For example, if a rectangular prism has a length of 5 units, a width of 3 units, and a height of 4 units, the surface area would be:
2(5)(3) + 2(5)(4) + 2(3)(4) = 30 + 40 + 24 = 94 square units.