Boyd/Usilton.  A pyramid is a polyhedron in which one face (base) can be any polygon and the other faces (lateral) are triangles.  A regular pyramid.

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Presentation transcript:

Boyd/Usilton

 A pyramid is a polyhedron in which one face (base) can be any polygon and the other faces (lateral) are triangles.  A regular pyramid is a pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles.

 A cone is a solid that has one base and a vertex that is not in the same plane as the base.  A right cone has an altitude that is a perpendicular segment from the vertex to the center of the base.

Pyramid L.A. = ½ pℒ p= perimeter of base ℒ = slant height S.A. = L.A. + B B= area of base Cone L.A.= ½ 2πr ℒ or πrℒ S.A. = L.A. + B