Here are the solutions to the questions: 7.1 If the 300 cm side of the rectangular tin plate is bent to form a circle, determine the diameter of the cylindrical tank. You may use the formula: Circumference of a circle = $\pi \times$ diameter; Using $\pi = 3.14$. Step 1: Identify the circumference of the circle. When the 300 cm side of the rectangular tin plate is bent to form a circle, this length becomes the circumference ($C$) of the circle. $$C = 300 \text{ cm}$$ Step 2: Use the given formula for the circumference of a circle. $$C = \pi \times D$$ Where $D$ is the diameter and $\pi = 3.14$. Step 3: Substitute the values and solve for the diameter ($D$). $$300 \text{ cm} = 3.14 \times D$$ $$D = \frac{300 \text{ cm}}{3.14}$$ $$D \approx 95.5414 \text{ cm}$$ Rounding to two decimal places: $$D \approx 95.54 \text{ cm}$$ The diameter of the cylindrical tank is $\boxed{\text{95.54 cm}}$. 7.2 Calculate the volume of water that the cylindrical tank can hold in litres. You may use the formula: Volume of a cylindrical tank = $\pi \times r^2 \times$ height; Using $\pi = 3.14$ and $1000 \text{ cm}^3 = 1 \text{ litre}$. Step 1: Determine the radius ($r$) and height ($h$) of the cylindrical tank. From 7.1, the diameter ($D$) is approximately $95.5414 \text{ cm}$. The radius ($r$) is half of the diameter: $$r = \frac{D}{2} = \frac{95.5414 \text{ cm}}{2} = 47.7707 \text{ cm}$$ The height ($h$) of the cylindrical tank is the other dimension of the rectangular plate: $$h = 250 \text{ cm}$$ Step 2: Calculate the volume of the cylindrical tank using the formula $V = \pi r^2 h$. Using $\pi = 3.14$: $$V = 3.14 \times (47.7707 \text{ cm})^2 \times 250 \text{ cm}$$ $$V = 3.14 \times 2282.038 \text{ cm}^2 \times 250 \text{ cm}$$ $$V = 3.14 \times 570509.5 \text{ cm}^3$$ $$V \approx 1791799.83 \text{ cm}^3$$ Step 3: Convert the volume from cubic centimeters to litres. Given $1000 \text{ cm}^3 = 1 \text{ litre}$. $$V_{\text{litres}} = \frac{1791799.83 \text{ cm}^3}{1000 \text{ cm}^3/\text{litre}}$$ $$V_{\text{litres}} \approx 1791.79983 \text{ litres}$$ Rounding to the nearest litre: $$V_{\text{litres}} \approx 1792 \text{ litres}$$ The volume of water the cylindrical tank can hold is approximately $\boxed{\text{1792 litres}}$. 3 done, 2 left today. You're making progress.