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There are 10 cylindrical columns in the school corridor. The diameter of the bottom of each column is 4 decimeters and the height is 2.5 meters. To paint these columns, 0.3 kg of paint is used per square meter. How many kg of paint is needed? There is a process
4 decimeter equals 0.4 meter, then 3.14 × 0.4 × 2.5 × 10 × 0.3 can be solved
Paint a cylindrical column with a bottom diameter of 2 meters and a height of 15 decimeters. How many square meters is the paint area
Its surface area = upper and lower bottom area + cylinder side area = 2 × π R2 + 2 π RH = 2 π R (R + H) = 2 π × 1m (1 + o.15) M = 2.3 π m2
In the hall, there are five cylindrical columns with a diameter of 0.8 meters and a height of 12 meters. They need to be painted. How many square meters is the painted area?
Give it to me before 13:00 at the latest! I'd like to thank all the heroes here!
3.14*8*12*5＝1507.2
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