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1. Polyhedron- A solid figure with many plane faces.

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2. Surface Area- The total area of the surface of a three dimensional object.

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It is A= 2(wl+hl+hw)

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http://www.teachertube.com/video/how-to-find-the-surface-area-of-a-triangular-prism-369990

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http://www.teachertube.com/video/surface-area-of-a-rectangular-prism-102227