May 1, 2013  Students will analyze and determine the surface areas of prisms and cylinders.  Why? So you can find the surface area of a drum, as in.

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Presentation transcript:

May 1, 2013

 Students will analyze and determine the surface areas of prisms and cylinders.  Why? So you can find the surface area of a drum, as in EX 22.  Mastery is 80% or Better on 5-minute checks and practice problems.

 A prism is a polyhedron with two congruent faces, called bases, that lie in parallel planes. The other faces called lateral faces, are parallelograms formed by connecting the corresponding vertices of the bases. The segments connecting these vertices are lateral edges.

 The altitude or height of a prism is the perpendicular distance between its bases. In a right prism, each lateral edge is perpendicular to both bases. Prisms that have lateral edges that are not perpendicular to the bases are oblique prisms. The length of the oblique lateral edges is the slant height of the prism.

 Prisms are classified by the shape of their bases. For example, the figures above show one rectangular prism and one triangular prism. The surface area of a polyhedron is the sum of the areas of its faces. The lateral area of a polyhedron is the sum of the areas of its lateral faces.

 Find the surface area of a right rectangular prism with a height of 8 inches, a length of 3 inches, and a width of 5 inches.  S= 2B + Ph = Ap+Ph

 Imagine that you cut some edges of a right hexagonal prism and unfolded it. The two-dimensional representation of all of the faces is called a NET.

 In the net of the prism, notice that the lateral area (the sum of the areas of the lateral faces) is equal to the perimeter of the base multiplied by the height.

Think…Ink…Share Ex. 2: Using Theorem 12.2

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 A cylinder is a solid with congruent circular bases that lie in parallel planes. The altitude, or height of a cylinder is the perpendicular distance between its bases. The radius of the base is also called the radius of the cylinder. A cylinder is called a right cylinder if the segment joining the centers of the bases is perpendicular to the bases.

 The lateral area of a cylinder is the area of its curved surface. The lateral area is equal to the product of the circumference and the height, which is 2  rh. The entire surface area of a cylinder is equal to the sum of the lateral area and the areas of the two bases.

Finding the Surface Area of a Cylinder Think…Ink…Share Find the surface area of the right cylinder.

 Find the height of a cylinder which has a radius of 6.5 centimeters and a surface area of square centimeters.

 What was the objective(s) for today?  Students will analyze and determine the surface areas of prisms and cylinders.  Why? So you can find the surface area of a drum, as in EX 22.  Mastery is 80% or Better on 5-minute checks and practice problems.

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