A cylindrical tin bucket without a cover has a bottom diameter of 30 cm and a height of 60 cm The inner and outer walls of the bucket should be coated with antirust paint. What is the area of antirust paint? (with formula)

The painted area is twice the sum of the bottom area and the side area of a cylinder
Floor area of 3.14 * (30 / 2) square = 706.5 (square centimeter)
Side area is 3.14 * 30 * 60 = 5652 (square centimeter)
The painting area is (706.5 + 5652) * 2 = 12717 (cm2)
12717 square centimeter = 1.2717 square meter

A cylindrical bucket without a cover is 24 cm high and 20 cm in diameter at the bottom. How many square centimeters of iron sheet does it take to make the bucket? (the number is kept as a whole.)
How many milliliters of water can this bucket hold

（1）3.14×20 /2 ×20 /2 +3.14×20×24,=314+1507.2,
=1821.2 (square centimeter),
About 1900 square centimeters
（2）（3.14×20/2×20/2 ）×24,
=314×24,
=7536 (ML)
A: this bucket needs 1900 square centimeters of iron sheet; this bucket can hold 7536 ml of water

A cylindrical tin bucket without a cover is 24 cm high and 20 cm in diameter at the bottom. How much tin does it take to make the bucket

20 / 2 = 10 * 10 * 3.14 = 314 square centimeter bottom area
3.14 * 20 = 62.8 62.8 * 24 = 2607.2 square centimeter surrounding area
Total area 2607.2 + 314 = 2914.2 square cm = 2914 square cm

A cylindrical tin bucket without a cover has a bottom diameter of 30 cm and a height of 60 cm The inner and outer walls of the bucket should be coated with antirust paint. What is the area of antirust paint? (with formula)