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Lines and Angles

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Term
Definition
Parallel Lines   Coplanar lines that do not intersect.  
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Skew Lines   Non-coplanar lines, are not parallel, and they do intersect.  
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Parallel Planes   Planes that do not intersect.  
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Transversal   A line that intersect two or more coplanar lines at distinct points.  
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Alternate Interior Angles   Nonadjacent interior angles that lie on opposite sides of the transversal.  
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Same-side Interior Angles   Interior angles that lie on the same-side of the transversal.  
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Corresponding Angles   Angles that lie on the same side of the transversal (t) and in corresponding positions.  
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Alternate Exterior Angles   Nonadjacent exterior angles that lie on opposite sides of the transversal.  
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Auxiliary Line   Line that you add to a diagram to help explain relationships in proofs.  
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Exterior Angle Of A Polygon   Angle formed by a side and an extension of an adjacent side.  
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Remote Interior Angles   Two nonadjacent interior angles.  
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Slope   measure of a line is the ratio of the vertical change Rise/Run  
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Slope-Intercept Form   Equation of a non-vertical line is y = mx + b, where m is the slope and b is the intercept.  
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Point-Slope Form   Equation of a non-vertical line is y - y^1 = m(x - x^1), where m is the slope and (x^1,y^1) is a point on the line.  
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Created by: mbuening
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