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### Introduction to Perimeter and Area
1. **Define Perimeter and Area:** - Define what perimeter and area are for plane shapes. - Explain the difference between them and their importance in geometry.
2. **Triangles:** - Discuss different types of triangles (e.g., equilateral, isosceles, scalene). - Introduce formulas for calculating the perimeter and area of triangles. - Provide examples and step-by-step calculations for each type of triangle.
3. **Trapeziums:** - Define what a trapezium is and its properties. - Present the formula for calculating the perimeter of a trapezium. - Explain how to find the area of a trapezium using the formula involving the bases and height. - Include examples illustrating the calculations.
4. **Parallelograms:** - Discuss the properties of parallelograms. - Present formulas for calculating the perimeter and area of parallelograms. - Provide examples with detailed calculations.
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