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## PowerPoint Slideshow about ' Surface Area and Nets' - meir

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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

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