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# Volumes of Prisms and Surface Area - PowerPoint PPT Presentation

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 units, so the volume of the prism is 5 cm · 2 cm · 3 cm = 30 cm 3. Example 1. Find the volume of the rectangular prism. Example 2.

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### Volumes of Prisms andSurface Area

#31

Volume is the number of cubic units needed to fill a space. V = lwh

Ex:Volume is expressed in cubic units, so the volume of the prism is 5 cm · 2 cm · 3 cm = 30 cm3.

Find the volume of the rectangular prism.

Find the volume of each rectangular prism.

To find the volume of any prism, you can use the formula V= Bh, where B is the area of the base, and h is the prism’s height.

Find the volume of thetriangular prism.

The bases of a prism are always two congruent, parallel polygons.

FYI

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.

• Find the surface area S of the prism.

• Method 1: Use a net.

• Find the surface area S of each prism.

• Method 2: Use a three-dimensional drawing.

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.

Find the surface area S of the pyramid.

To find the area of the curved surface of a cylinder, multiply its height by the circumference of the base.

FYI

• The surface area of a cylinder equals the sum of the area of its bases and the area of its curved surface.

Find the surface area S of the cylinder. Use 3.14 for , and round to the nearest hundredth.