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Surface Areas of Prisms  Lesson 121
Today we began to discuss Surface Area. In order to do this, we started by discussing polyhedra:
We then noted that polyhedra are classified by the number of faces. For instance, a 4faced polyhedrdon is called a tetrahedron:
A 6faced polyhedron is called a hexahedron:
A 7faced polyhedron is called a heptahedron:
And a 10faced polyhedron is called a decahedron:
We then defined a regular polyhedron and showed an example regular dodecahedron:
At this point, we defined a prism and learned what the lateral surface area and the total surface area of these polyhedra were:
Finally, we defined right prism, oblique prism, and altitude of a prism:
At this point, we went through the following examples. First we looked at finding the total surface area of a right rectangular prism:
We then looked at this problem  find the total surface area of the right pentagonal prism shown below:
In order to solve this problem, we looked at the bases and the lateral faces:
These are shapes we know, so we found their area and added them together to get the answer:
