parallel lines

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          In geometryparallel lines are lines in a plane which do not meet; that            is, two lines in a plane that donot intersect or touch each other at any                    point are said to be parallel. 

 

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  • Interior angleAn interior angle of a polygon is an angle inside the polygon at one of its vertices. Angle Q is an interior angle of quadrilateral QUAD.

  • Exterior angleAn exterior angle of a polygon is an angle outside the polygon formed by one of its sides and the extension of an adjacent side.

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