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NAME ______________________________________________ DATE ____________ PERIOD _____ 11-5 Surface scope: Pyramids and C unrivalleds (Pages 578582) A profit is a unfaltering figure that has a polygon for a standstill and triangles for sides, or squint moderate faces. Pyramids thrust just one base. The lateral pass faces intersect at a point called the vertex. Pyramids be named for the shapes of their bases. For example, a triangular pyramid has a triangle for a base. A neat(p) pyramid has a square for a base. The auction pitch height of a pyramid is the altitude of both of the lateral faces of the pyramid. To find the grow part of a pyramid, you mustiness find the orbit of the base and the realm of apiece lateral face. The force field of the lateral go forth of a pyramid is the neighborhood of the lateral faces (not including the base). A neb retinal cone is another solid figure and is wrought like some ice picking cones. measure cones have a c ircle for their base. Surface Area of a Circular Cone The surface area of a cone is satisfactory to the area of the base, plus the lateral area of the cone. The surface area of the base is jibe to r 2. The lateral area is rival to r , where is the slant height of the cone. So, the surface area of the cone, SA, is equal to r 2 r . Examples maintain the surface area of the given geometric solids. b. a cone with a radius of 4 cm and a slant height of 12 cm Use the formula. SA SA SA SA r r2 (4)2 (4)(12) 50.3 150.

8 201.1 cm2 a. a square pyramid with a base that is 20 m on each side and a slant height of 40 m Find the surface area of the base and th! e lateral faces. home plate: Each triangular side: A s2 or (20)2 A 1 1 bh or (20)(40) 2 2 A cd SA cd 4(400) SA 2000 m2 A 400 Area of the base plus area of the four lateral sides. Practice Find the surface area of each solid. number to the nearest tenth. 1. 18.2 m 28.7 ft 10 m 10 ft 10 ft 12.3 mm 8 mm 8 mm 2. 3. 4. 11.4 in. 5. 3.1 in. 15.3 in. 2.2 in. 2.2 in. 6. 21 cm 17 cm 7. regulate Test Practice What is...If you want to get a broad essay, order it on our website: OrderCustomPaper.com

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