## The Pyramid

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Prism is a polyhedron in which two faces are equal polygons in parallel planes, and all other faces are parallelograms. There are two types of prism; oblique prism and right prism. Oblique prism is when the axis is *not* perpendicular to the base and right prism if the axis is parallel to the base. In right prism, all lateral areas are rectangle.

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**Side**

Side of a triangle is a line segment that connects two vertices. Triangle has three sides, it is denoted by *a*, *b*, and *c* in the figure below.

**Vertex**

Vertex is the point of intersection of two sides of triangle. The three vertices of the triangle are denoted by *A*, *B*, and *C* in the figure below. Notice that the opposite of vertex *A* is side *a*, opposite to vertex *B* is side *B*, and opposite to vertex *C* is side *c*.

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