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Unformatted text preview: • If 2 nonvertical lines are perpendicular, the product of their slopes is 1. • If the slopes of 2 lines have a product of 1, the lines are perpendicular. • Any horizontal line and vertical line are perpendicular. undefined slope zero slope positive slope negative slope Joke Time What do you call a hippo in a phone booth? stuck What would America be called if we all drove pink cars? A pink carnation...
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 Fall '10
 Towns
 Geometry, Slope, slopes

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