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Pairs of Lines Angles right angle straight angle acute angle obtuse angle Parallel lines right angle A D G H E F I Definition Examples How to write it How to say it An angle is made up of two rays that share the same endpoint called the vertex. A straight angle forms a straight line. A right angle forms a square corner. never intersect or cross one another Intersecting lines meet at the same point Perpendicular lines cross each other and form right angles An acute angle is less than a right angle. An obtuse angle is greater than a right angle. A ray is part of a line with one endpoint and goes on forever in the other direction. A line segment is part of a line between two endpoints. A line is a straight collection of points that extend in two opposite directions without end. A point is a location in space. Line Segment Line Ray Angle Point • line segment AB • line segment CD • line segment EF or or or or • line AB • line CD • line EF AB CD EF • ray AB • ray CD • ray EF • angle BAC • angle CAB • angle A BAC CAB A • point A • point B • point A • point B AB CD EF AB CD EF A A B D C F E B C vertex endpoint side side A B C F E A B D A B C D F E © Copyright NewPath Learning. All Rights Reserved. 93-4406 www.newpathlearning.com Lines & Angles

\|xiBAHBDy01649mzV Pairs of Lines Angles A D G H E F I Definition Examples How to write it How to say it Line Segment Line Ray Angle Point Key Vocabulary Terms • acute angle • parallel line • angle • perpendicular line • intersecting line • point • line • ray • line segment • right angle • obtuse angle • straight angle © Copyright NewPath Learning. All Rights Reserved. 93-4406 www.newpathlearning.com Lines & Angles