April 20, 2012 12-2 Nets & Surface Area Net: * A two dimensional pattern of a 3-d object. * Can be folded to form the 3-d object. * Helpful in visualization of the polygons that make up the surface of a solid. a b c a b d c a b a What 3D object do you think this turns out to be? c Square Pyramid Dodecahedron Icosahedron Right Cone April 20, 2012 Draw a cube with 4 units on each edge. April 20, 2012 Surface Area: * How much material is needed to cover the whole surface. * Think of wrapping a present!!!! * It is the sum of the areas for each face of solid. Example: Find the Surface Area of the Kleenex box April 20, 2012 Ex 1: Find the surface area of the rectangular prism 8 cm 5 cm 4 cm 2. Find the surface area of the figure 5m 5m 5m April 20, 2012 3. Draw the net of the figure and then find the surface area. 10 cm 8 cm 8 cm 4. Find the surface area of the figure below Name: How many faces are there? 5 in 8 in 12 in April 20, 2012 4. 5 in 8 in 5 in 12 in 8 in 12 in 5 in 8 in 12 in 5 in 8 in 12 in 5 in 8 in 12 in

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