9-2 Review 1. Draw a line perpendicular to a plane. 2. Draw two parallel planes.

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Presentation transcript:

9-2 Review 1. Draw a line perpendicular to a plane. 2. Draw two parallel planes.

Quote of the Day “The key to immortality is first living a life worth remembering.” -Dan Bradford

9-3 REVIEW Tell which 3-d figure most resembles the real world object. Be as specific as you can A cd A pup tent

9-4 Pyramids and Cones

Pyramids Used by Egyptians as ancient burials Used in architecture Pyramid-has one base that is a polygon, a vertex and set of all points on segments joining the vertex to any point on the base.

KhufuKhufu and his pyramidand his pyramid

Pyramids (continued) Classified by its base. Classified by its base. Has lateral edges, base edges, and faces. (All lateral faces are what figure??) Has lateral edges, base edges, and faces. (All lateral faces are what figure??) Regular pyramids have regular polygons for bases. Regular pyramids have regular polygons for bases.

Cones Has one base and a vertex, like a pyramid The base is a circle Slant height, height Oblique & right cones

A city has stored salt to use on the streets in the winter. The salt pile forms a right cone. Suppose the distance from the vertex to any point on the circumference of the base is 35 feet. The diameter of the base is 30 feet. How high is the pile of salt? Example

Example A regular square pyramid has a base of side length 10 and a slant height of 13. What is the height of the pyramid?

Assignment: Do pages , 18 Quiz 9-1 to 9-3 Wednesday