1&6+Pyramids

= 1&6 Pyramids = =__PYRAMID FACTS__ //by Caroline, Aubrey, Austin, and Erik// =  A polyhedron is a pyramid if it has 3 or more triangular faces sharing a common vertex. The base of a pyramid may be any polygon. If the base is a triangle too, then the pyramid has four faces. This is the simplest polyhedron, also called a tetrahedron, from the Greek word "tetra", meaning "four".


 * =Pyramid= ||
 * [[image:http://www.mathsisfun.com/geometry/images/pyramid-defined.jpg width="358" height="191" caption="image"]] || A solid object where:


 * The base is a polygon (a straight-sided shape)


 * The sides are triangles which meet at the top (the apex).

It is a polyhedron.

This is a square pyramid, but there are also triangular pyramids, pentagonal pyramids, and so on. ||

**A pyramid is a polyhedron with a single base and lateral faces that are all triangular. All lateral edges of a pyramid meet at a single point, or vertex.

Pyramid Volume Theorem

The volume V of any pyramid with height h and a base with area B is equal to one-third the product of the height and the area of the base.

Formula: V = (1/3)Bh



A //regular pyramid// is a pyramid that has a base that is a regular polygon and with lateral faces that are all congruent isosceles triangles.**

This is a activity showing area and volume on not just pyramids, abut also other shapes

[|www.shodor.org/interactivate/activities/SurfaceAreaAndVolume/]

This is a video showing volume in a pyramid = media type="youtube" key="oYGvNlaxnbw" height="344" width="425" =