4. Integers
6. Fractions
7. Decimals
10. Unitary Method
13. Mensuration
14. Geometry
14.2. Types of Lines
14.4. Angle
14.5. Triangles
14.5.1. Introduction to Triangles
14.5.3. Types of Triangles by Angles
14.5.4. Angle Sum Property of a Triangle
14.5.5. More about Triangle
14.6. Quadrilateral
14.7. Polygon
14.8. Circle
16. Linear Symmetry
17. Data Handling