1. **State the problem:** Find the area of rectangles using the formula $$A = l \times b$$ and find the actual area when $$l=3$$ cm and $$b=1$$ cm. 2. **Formula and rules:** The area $$A$$ of a rectangle is calculated by multiplying its length $$l$$ by its breadth $$b$$. 3. **Solve each part:** **a)** Given sides: $$5$$ and $$2$$ $$A = 5 \times 2 = 10$$ **b)** No data given, so cannot calculate. **c)** Sides: $$7+3$$ and $$8-2$$ Calculate each side: $$7+3=10$$ $$8-2=6$$ Area: $$A = 10 \times 6 = 60$$ **d)** Sides: $$12-8$$ and $$11+3$$ Calculate each side: $$12-8=4$$ $$11+3=14$$ Area: $$A = 4 \times 14 = 56$$ 4. **Find actual area when $$l=3$$ cm and $$b=1$$ cm:** $$A = 3 \times 1 = 3$$ 5. **Volume formula:** Volume $$V = l \times b \times h$$ for solids. 6. **Volume expressions:** No specific dimensions given for volumes, so cannot calculate actual values. **Summary:** - a) Area = 10 - b) No data - c) Area = 60 - d) Area = 56 - Actual area for $$l=3$$ and $$b=1$$ is 3