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  3. Geometry
  4. Quadrilateral
  5. Special Types of Quadrilateral
Grade 6
1. Large Numbers (7-Digit to 9-Digits)
2. Roman Numerals
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. Types of Lines
14.3. Collinear and Non-Collinear Points
14.4. Angle
14.5. Triangles
14.6. Quadrilateral
14.6.1. Introduction to Quadrilaterals
14.6.2. Special Types of Quadrilateral
14.6.3. Angle Sum Property of a Quadrilateral
14.6.4. More about Quadrilateral
14.7. Polygon
14.8. Circle
15. Three Dimensional (3-D) Shapes
16. Linear Symmetry
17. Data Handling

Grade 6 Sri Lanka School Math Special Types of Quadrilateral

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