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  4. Closed Curve
  5. Quadrilateral
Grade 6
1. Large Numbers (7-Digit to 9-Digits)
2. Roman Numerals (up to 1000)
3. Whole Numbers
4. Integers
5. Factors and Multiples
6. Fractions
7. Decimals
8. Simplification
9. Ratio and Proportion
10. Unitary Method
11. Algebraic Expressions
12. Linear Equations in One Variable
13. Mensuration
14. Geometry
14.1. Understand the Basic Terms in Geometry (Point, Line, Line Segment, Ray, and Plane)
14.2. Count the Number of Line Segments
14.3. Types of Lines
14.4. Intersecting Lines
14.5. Closed Curve
14.5.1. Simple Closed Curve
14.5.2. Identifying Closed and Open Figures
14.5.3. Polygon
14.5.4. Quadrilateral
14.5.4.1. Introduction to Quadrilaterals
14.5.4.2. Convex and Concave Quadrilaterals
14.5.4.3. Interior and Exterior of a Quadrilateral
14.5.4.4. Angle Sum Property of a Quadrilateral
14.5.4.5. Special Types of Quadrilateral
14.5.5. Circle
15. Three Dimensional (3-D) Shapes
16. Linear Symmetry
17. Data Handling

Grade 6 Sri Lanka School Math Quadrilateral

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