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These notes cover the Class 9 Mathematics chapter – Lines and Angles in a clear, simple, and well-structured manner. All important concepts are explained step by step with proper definitions, theorems, rules, and examples. What’s included in the notes: Easy-to-understand definitions of basic terms (point, line, ray, line segment, collinear points, etc.) Detailed explanation of types of angles (acute, right, obtuse, reflex, straight) Pair of angles (complementary, supplementary, adjacent, linear pair, vertically opposite angles) Axioms and theorems with simple proofs Angle sum property of a triangle with explanation Properties of parallel lines and transversal with diagrams Practice questions and solved examples for better clarity Perfect for Class 9 students (CBSE/ICSE/State Board) Useful for quick revision before exams Easy language so anyone can understand These notes are designed to save your time, clear your doubts, and make exam preparation stress-free.