May 16thh

•May 16th
•Finding the surface area of a pyramid.
•A pyramid is a polyhedron in which the base is a polygon and the lateral faces are triangles with a common vertex. The intersection of two lateral faces is a lateral edge. The intersection of the base and a lateral face is a base edge. The altitude or height of a pyramid is the perpendicular distance between the base and the vertex.
•More on Pyramids
A regular pyramid has a regular polygon for a base and its height meet the base at its center. The slant height of a regular pyramid is the altitude of any lateral face. A non-regular pyramid does not have a slant height.
•Ex 1. Finding the Area of Lateral Face.
•Architecture. The lateral faces of the Pyramid Arena in Memphis, Tennessee are covered with steel panels. Use the diagram of the arena to find the area of each lateral face of this regular pyramid.