There are six columns in the hall. The bottom radius of each column is 4 decimeters and the height is 5 meters. If the painting fee is 0.5 yuan per square meter, how much is the total painting fee for the six columns?

There are six columns in the hall. The bottom radius of each column is 4 decimeters and the height is 5 meters. If the painting fee is 0.5 yuan per square meter, how much is the total painting fee for the six columns?


4 decimeter = 0.4 meter, the total area of painting: 3.14 × 0.4 × 2 × 5 × 6, = 3.14 × (0.4 × 2 × 5 × 6), = 3.14 × 24, = 75.36 (square meter), the total cost of painting: 0.5 × 75.36 = 37.68 (yuan). Answer: the total cost of painting is 37.68 yuan