There are four cylindrical columns in the corridor outside the classroom. The diameter of the bottom of each column is 6 decimeters. Paint these columns with 0.3 paint per square meter Kg, how many kg of paint are needed? (the number obtained shall be kept to two decimal places)

There are four cylindrical columns in the corridor outside the classroom. The diameter of the bottom of each column is 6 decimeters. Paint these columns with 0.3 paint per square meter Kg, how many kg of paint are needed? (the number obtained shall be kept to two decimal places)

An xiamo is sad,
Diameter: 6 decimeters = 0.6 meters
Requirement: 3.14 × 0.6 × 3 × 4 × 0.3 = 6.7824 (kg) ≈ 6.79 (kg)

There are 10 cylindrical columns in the hall of a hotel. The diameter of the bottom of each column is 4 decimeters and the height is 3 meters. Now we need to paint these columns with oil per square meter
Paint 0.3 kg, how many kg of paint are needed

To paint a cylindrical column, only the side area of the column needs to be calculated
4 decimeters = 0.4 meters
3.14×0.4×3×10×0.3
=3.768×10×0.3
=37.68×0.3
=11.304 (kg)
A: a total of 11.304 kg of paint is required

There are six large cylindrical columns in a building to be painted. It is known that the diameter of the bottom surface of the column is 8 decimeters and the height is 5 meters. It is calculated as 4 square meters per kilogram of paint,
How many kilos of paint do you need

(3.14*0.8*5/4)*6=18.84kg