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# 12.3 notes

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### 12.3 notes

1. 1. BellworkGet a dodecahedron and icosahedron from the back table.Find the surface area of each.Turn in bellwork to homework bin.
2. 2. Regular Pyramids: 12.3 Surface Area ***before you can find the SA of a regular pyramid, you must first identify the shape of the base and how to find the perimeter of the base vertex S.A. = ½Pl + B Slant Height (l )a lt it u d e ( h where b is the area of the base) or a S.A. = ½P(l + a) Base one-half perimeter of the base * the sum of the slant height and apothem
3. 3. Find the surface area of each regular pyramid. 5cm 10 cm base altitude is 6.9cm a 8 cm 7 cm
4. 4. Find surface area.13 in 5 in 7.3 in
5. 5. Cones: S.A. = πr + r 2 πl area of the base + r*pi*slant height Slant Height r
6. 6. Find the surface area of each cone. 2.6 yd 3.2 cm 6.4 yd 1.4 cm
7. 7. Find the surface area of the solid. 5 ft 5 ft 3 ft
8. 8. 12.3 HW pg. 814#4-24 evens