Lesson 3: Surface Area - Right Prisms and Right Cylinders

   Constructing Knowledge

To find the surface area of a 3D object, the 2D shapes that make up the surfaces of the object must first be defined.

Surface area
The surface area of a 3D object is the total area of the object’s net.

The following are surface area formulas of familiar three-dimensional objects.

Right Rectangular Prism

Right Triangular Prism

Right Cylinder


For all calculations: When π is used in a formula, use the π function of your calculator or you can use 3.14 for the value of π.


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