1. The problem asks for topics in Class 10 NCERT Maths that are not mentioned in the book. 2. NCERT Class 10 Maths book covers topics like Real Numbers, Polynomials, Pair of Linear Equations, Quadratic Equations, Arithmetic Progressions, Triangles, Coordinate Geometry, Trigonometry, Circles, Constructions, Areas Related to Circles, Surface Areas and Volumes, Statistics, and Probability. 3. Topics not mentioned in the NCERT Class 10 Maths book typically include advanced or supplementary topics such as: - Complex Numbers - Matrices and Determinants - Probability beyond basic concepts - Coordinate Geometry in 3D - Advanced Trigonometric Identities 4. These topics are usually introduced in higher classes or in other reference books. 5. For Class 10 NCERT syllabus, focus on the topics explicitly listed in the book for exam preparation.