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There are 10 columns in the corridor. The radius of the bottom of each column is 4 decimeters and the height is 2.5 meters There are 10 cylindrical columns in the school corridor. The bottom radius of each column is 4 decimeters, and the height is 2.5 meters. To paint these columns for the celebration of June 1 performance, 0.3 kg of paint is used per square meter. How many kg of paint are needed?
4 decimeters = 0.4 meters
Side area of each column: 3.14 * 0.4 * 2 * 2.5 = 6.28
Lateral area of 10 roots: 6.28 * 10 = 62.8
Total paint required: 0.3 * 62.8 = 18.84
There are 8 Pillars in the hall of children's palace, each of which is 6 meters high. These pillars share 75.36kg paint (0.5kg paint per square meter). The bottom of the pillars is straight
What is the diameter of the bottom of the column?
Let the bottom radius of the column be X
14 = 75. 36 × 2
The square of x = 1
x＝1
1×2＝2（m）
A: "the diameter of the bottom of the column is 2m."
There are two cuboid pillars in the children's palace, which are 4 meters high. The ground is square and the perimeter of the bottom is 1.2 meters. What is the total area of the two pillars painted
Side area = 4.4 square meters
4.8 × 2 = 9.6 (M2)
The total area is 9.6 square meters
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