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Surface Area of Prisms and Cylinders Section 12.2. Goal – to find the surface area of a prism and the surface area of a cylinder. Prisms & Cylinders. Polyhedron – a solid bounded by polygons. Prism – a polyhedron with two congruent parallel faces called bases.
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Surface Area of Prisms and CylindersSection 12.2 Goal – to find the surface area of a prism and the surface area of a cylinder
Prisms & Cylinders Polyhedron – a solid bounded by polygons Prism – a polyhedron with two congruent parallel faces called bases Cylinder – a solid with congruent circular bases that lie in parallel planes radius base base altitude height Lateral face (4) base base
Surface Area verses Lateral Area of a Prism The lateral area of a polyhedron or prism is the sum of the area of its lateral faces. LA = Ph P = Perimeter of the base h = height of 3-D shape • The surface area of a polyhedron or prism is the sum of area if its faces. • SA = Ph + 2B B = Area of the base
Surface Area verses Lateral Area of a Cylinder The lateral area of a cylinder is the area of its curved surface. LA = r = radius of the base h = height of 3-D shape • The surface area of a cylinder is equal to the sum of the lateral area and the areas of the two bases. • SA =