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Surface Areas of Prisms - Lesson 12-1
Today we began to discuss Surface Area. In order to do this, we started by discussing polyhedra:
![Polyhedra Definition](Polyhedra.gif)
We then noted that polyhedra are classified by the number of faces. For instance, a 4-faced polyhedrdon is called a tetrahedron:
![Tetrahedron](Tetrahedron.gif)
A 6-faced polyhedron is called a hexahedron:
![Hexahedron](Hexahedron.gif)
A 7-faced polyhedron is called a heptahedron:
![Heptahedron](Heptahedron.gif)
And a 10-faced polyhedron is called a decahedron:
![Decahedron](Decahedron.gif)
We then defined a regular polyhedron and showed an example regular dodecahedron:
![Definition of a Regular Polyhedron](RegularPolyhedron.gif)
At this point, we defined a prism and learned what the lateral surface area and the total surface area of these polyhedra were:
![Prisms and Surface Area](PrismsSurfaceArea.gif)
Finally, we defined right prism, oblique prism, and altitude of a prism:
![Right and Oblique Prisms](RightPrism.gif)
At this point, we went through the following examples. First we looked at finding the total surface area of a right rectangular prism:
![Example Problem](Example1.gif)
We then looked at this problem - find the total surface area of the right pentagonal prism shown below:
![Example Problem 2 - Question](Example2.gif)
In order to solve this problem, we looked at the bases and the lateral faces:
![Example 2 - First Step](Example2Step1.gif)
These are shapes we know, so we found their area and added them together to get the answer:
![Example 2 - Step 2](Example2Step2.gif)
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