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The diameter of the bottom of the pillars in the hall is 6 decimeters, and the height is 5 meters. Paint the eight pillars. Use 0.5 kg per square meter. How much paint do you need?
Side area of 1 column: 3.14 * 0.6 * 5 = 9.42 M2
Side area of 8 columns: 9.42 * 8 = 75.36 square meters
Paint required: 75.36 * 0.5 = 37.68kg
The lobby of a hotel has 6 large cylindrical columns, 10 meters high and 25.12 decimeters in circumference. All the columns should be painted. If the painting fee per square meter is 80 yuan, how much will it cost?
25.12 decimeters = 2.512 meters, the total area to be painted: 2.512 × 10 × 6, = 150.72 (square meters), 150.72 × 80 = 12057.6 (yuan); answer: the total cost of painting these columns is 12057.6 yuan
The lobby of a hotel has 6 large cylindrical columns, 10 meters high and 25.12 decimeters in circumference. All the columns should be painted. If the painting fee per square meter is 80 yuan, how much will it cost?
25.12 decimeters = 2.512 meters, the total area to be painted: 2.512 × 10 × 6, = 150.72 (square meters), 150.72 × 80 = 12057.6 (yuan); answer: the total cost of painting these columns is 12057.6 yuan
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