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  3. Mensuration
  4. Perimeter and Area of Plane Figures
  5. Measuring Areas of Quadrilaterals
  6. Area of a Quadrilateral Using Heron's Formula
Grade 10
1. Real numbers
2. Polynomials
3. Linear Equations in Two Variables
4. Triangles
5. Trigonometry
6. Statistics and Probability
7. Quadratic Equations
8. Arithmetic Progression (AP)
9. Circles
10. Coordinate Geometry
11. Mensuration
11.1. Perimeter and Area of Plane Figures
11.1.1. Measuring Areas of Triangles
11.1.2. Measuring Areas of Quadrilaterals
11.1.2.1. Area Between Two Rectangles
11.1.2.2. Area of a Quadrilateral
11.1.2.3. Area of a Parallelogram
11.1.2.4. Area of a Rhombus
11.1.2.5. Area of a Trapezium
11.1.2.6. Area of a Quadrilateral Using Heron's Formula
11.1.2.7. Application of Results on Area of Polygonal Regions
11.1.3. Area of circles, sectors and segments
11.1.4. Areas of Combinations of Plane Figures
11.2. Volume and Surface Area of Solids

Grade 10 Sri Lanka School Math Area of a Quadrilateral Using Heron's Formula

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