### Lines and AnglesLines and Angles

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 Editor Ramacharyulu, N.Ch.Pattabhi Illustrator Soni, Prashanth Source SCERT Andhra Pradesh Content type Text Publisher Government of Andhra Pradesh File Format PDF Copyright Year ©2013 Language English Difficulty Level Medium
 Subject Domain (in DDC) Natural sciences & mathematics ♦ Mathematics ♦ Geometry Subject Keyword Triangle ♦ Transversal ♦ Exterior Angles ♦ Quadrilateral ♦ Linear Pair Axiom Table of Contents Chapter 4) Lines and Angles  4.1) Introduction4.2) Basic Terms in Geometry  4.2.1) Intersecting Lines and Non-Intersecting Lines  4.2.2) Concurrent Lines4.3) Pairs of Angles  4.3.1) Linear Pair of Angles Axiom  4.3.2) Angles in Intersecting Lines4.4) Lines and a Transversal  4.4.1) Lines Parallel to the Same Line  4.5) Angle Sum Property of a Triangle Description This is the third chapter namely “Lines and Angles” of book entitled “Mathematics: class 9”. This chapter deals with Lines and Angles. The notion of line or straight line was introduced by ancient mathematicians to represent straight objects (i.e., having no curvature) with negligible width and depth. Lines are an idealization of such objects. In planar geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in a plane, but this plane does not have to be a Euclidean plane. Angles are also formed by the intersection of two planes in Euclidean and other spaces. It includes some exercises and problems with solution. Educational Role Student ♦ Teacher Age Range 13 to 17 years Educational Use Classroom ♦ Reading Interactivity Type Expositive Education Level IX and X Learning Resource Type Book Educational Framework Andhra Pradesh Board of Secondary Education (APBSE) Time Required P1W2D Publisher Date 2013 Publisher Place Hyderabad Size (in Bytes) 552.99 kB Page Count 36