The area of aluminum needed to make the mailboxes is 1347 m²
How to find the area
The area required here is
= 1/2 total surface area of cylinder + total surface area of rectangular prism
total surface area of cylinder
= 0.5 (2πr(r + h)
= 3.14 * 0.1(0.1 + 0.3)
= 0.1256
total surface area of rectangular prism
= 2(lw + lh + wh)
= 2 (0.2 * 0.3 + 0.2 * 0.45 + 0.3 * 0.45)
= 0.57
Area of aluminum
- 0.1256 + 0.57
= 0.6359
total area
= 0.6953 * 1935 mail boxes
= 1347 m²