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9.3: Surface Area of Pyramids and Cones Geometry Name:____________________________ Pyramid: Height of a pyramid: Slant Height of a pyramid: Example 1: Find the slant height of the pyramid. Round your answer to the nearest whole number. a. b. Try: Find the slant height of the pyramid. Round your answer to the nearest whole number. Surface area of a pyramid Surface area = (area of the base) + area of the lateral faces = ( = )+( = )∙ + Surface Area of a Pyramid: S= Example 2: Find the surface area of the pyramid. a. b. Try: Find the surface area of the pyramid. a. b. Surface Area of a Cone Height of a cone: Surface area Slant Height of a cone: = (area of the base) + area of the sector = ( )+( )∙ Surface Area of a Cone: S= Example 3: Find the approximate surface area of the cone to the nearest whole number. a. b. Try: Find the approximate surface area of the cone to the nearest whole number. Homework: pg. 495: #9-22 all, 23 – 27 odds