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Unformatted text preview: any two straight lines that are NOT parallel will cross at a single point) and they form a 90 degree angle, or rather, a T-shape. For example: The x-axis and y-axis are perpendicular to each other. Mathematically, if line 1 has a slope of m1, then a perpendicular line 2 will have a slope m2= (-1/m1) that is, its slope will be the negative inverse of the first....
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- Spring '09