Surface Area and Nets

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# Surface Area and Nets - PowerPoint PPT Presentation

Surface Area and Nets. Polyhedron. Polyhedron: a 3-dimensional object, or solid, whose faces are polygons. Polyhedron. Parts of Polyhedrons. Face: a flat surface on a solid Edge: segments joining faces together Vertex: corner; the point where 3 or more faces meet. Prism.

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### Surface Area and Nets

Polyhedron
• Polyhedron: a 3-dimensional object, or solid, whose faces are polygons
Parts of Polyhedrons
• Face: a flat surface on a solid
• Edge: segments joining faces together
• Vertex: corner; the point where 3 or more faces meet
Prism
• Prism: a polyhedron whose bases are congruent and parallel
• Prisms are named for the shape of their bases.
Pyramid
• Pyramid: a polyhedron that has a polygonal base but comes to a point
Pyramid
• Pyramids are named after the shape of their base
Nets
• Net: a flat figure that can be folded to form a closed three-dimensional object (solid).
• We can use nets to help figure out the surface area of a solid shape
• http://www.learner.org/interactives/geometry/area_surface.html
Nets
• Rectangular Prism
Nets
• Triangular Prism
Nets
• Square Pyramid
Surface Area
• Surface Area: the sum of the areas of all the faces of a 3D figure
• To find the surface area of any shape, you can follow the process described below:
• Draw a net of the polyhedron.
• Calculate the area of each face.
• Add up the area of all the faces.
Sources
• Most of the information and some of the pictures on these slides comes from mathisfun.com
• Some information comes from the textbook: Middle School Math by Scott Foresman—Addison Wesley Course 2, 1998
• Some drawings come from various locations on the web