Presentation on theme: "Volumes of Prisms and Surface Area #31. Vocabulary Volume is the number of cubic units needed to fill a space. V = lwh Ex:Volume is expressed in cubic."— Presentation transcript:
Vocabulary The surface area of a three-dimensional figure is the sum of the areas of its surfaces. To help you see all the surfaces of a three-dimensional figure, you can use a net. A net is the pattern made when the surface of a three- dimensional figure is layed out flat showing each face of the figure.
Example 1 Find the surface area S of the prism. Method 1: Use a net.
Example 2 Find the surface area S of each prism. Method 2: Use a three-dimensional drawing.
FYI The surface area of a pyramid equals the sum of the area of the base and the areas of the triangular faces. To find the surface area of a pyramid, think of its net.
Example 3 Find the surface area S of the pyramid.
FYI The surface area of a cylinder equals the sum of the area of its bases and the area of its curved surface. To find the area of the curved surface of a cylinder, multiply its height by the circumference of the base. Helpful Hint
Example 4 Find the surface area S of the cylinder. Use 3.14 for , and round to the nearest hundredth.