Surface Area of Pyramids and Cones

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Presentation transcript:

Surface Area of Pyramids and Cones Lesson 7-8 Surface Area of Pyramids and Cones

Definition Lateral Faces- The triangular sides of a pyramid. Slant Height - The altitude or height of each lateral face. Lateral Area - The sum of the areas of the lateral faces.

Net for a square pyramid Base Lateral Face Slant height

Net of Cone Model of Cone r l l r

Formulas Surface Area of a Cone The surface area S of a cone with slant height l and radius r is the lateral area plus the area of the base.

Find the surface area of the triangular pyramid. A = 10.8 in2 5 in 5 in

Find the surface area of cone. Round to the nearest tenth. 4.5m 1.5 m