1. **Stating the topic:** Mensuration is the branch of mathematics that deals with the measurement of geometric figures and their parameters like length, area, and volume. 2. **Important formulas and rules:** - For 2D shapes, we calculate perimeter and area. - For 3D shapes, we calculate surface area and volume. - Common formulas include: - Rectangle area: $$A = l \times w$$ - Circle area: $$A = \pi r^2$$ - Triangle area: $$A = \frac{1}{2} \times base \times height$$ - Cube volume: $$V = a^3$$ - Cylinder volume: $$V = \pi r^2 h$$ 3. **Explanation:** Mensuration helps us find how much space a shape covers or how much it can hold. We use specific formulas depending on the shape. 4. **Practice problems:** - Find the area of a rectangle with length 8 and width 5. - Calculate the volume of a cube with side length 4. - Find the surface area of a cylinder with radius 3 and height 7. Try solving these to get comfortable with mensuration!