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Surface Area of Prisms

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Lesson Objective Students will work with a formula for the surface area of a prism.

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Lesson Beginning In your own words, define surface area. List 3 real life examples where you would need to find surface area.

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Surface Area of Prisms Surface area of a polyhedron is the sum of the areas of its faces. The surface area of any prism is the sum of the areas of the bases and the lateral faces. S = areas of bases + areas of lateral faces

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**Surface Area of a Rectangular Prism**

SA = 2(lw + lh + wh)

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**Surface Area of Triangular Prisms**

SA = Area of three rectangles + Area of two triangles

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Modeling Find the surface area of the prism.

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Practice Find the surface areas of the rectangular prisms

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Modeling Find the surface area of the prism.

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Practice Find the surface areas of the triangular prisms

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Practice Fifty percent of the surface area of the bread is crust. What is the height h?

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Practice Which prism has the greater surface area?

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Practice Draw and label a rectangular prism that has a surface area of 158 square yards.

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Practice Find the surface area.

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