There are 10 cylindrical columns in the hall of the children's palace. The perimeter of its bottom surface is 1.8 meters, and the height is 6.5 meters. If you use about 650 grams of paint per square meter, you can finish these columns How many kilos of paint does the column need?

There are 10 cylindrical columns in the hall of the children's palace. The perimeter of its bottom surface is 1.8 meters, and the height is 6.5 meters. If you use about 650 grams of paint per square meter, you can finish these columns How many kilos of paint does the column need?

1. Calculate the side area of cylinder: (perimeter of bottom surface × height)
1.8 × 6.5 = 11.7 (M2)
2. Weight of paint: 11.7 × 650 △ 1000 = 7.605 (kg)

Paint four cylindrical columns in the hall. It is known that the height of the column is 4 meters, the bottom radius is 0.5 meters, and 0.4 kg of paint is needed per square meter. How much paint is needed to finish this column

3.14×0.5×2×4×4×0.4
=3.14×16×0.4
=50.24×0.4
=20.096kg
A total of 20.096 kg of paint will be needed to finish all the four columns

There are 8 columns in the hall. The perimeter of the bottom surface of each column is 25.12dm, and the height is 7m. If the painting fee is 0.5 per square meter, how much is the total cost of painting 8 columns?
What do you want in each book

Hello, Yu Chuanhui
Bottom perimeter: 25.12 decimeters = 2.512 (meters)
Each piece to be painted: 2.512 × 7 = 17.584 (M2)
Total requirement: 17.584 × 8 × 0.5 = 70.336 yuan