There are four cylindrical concrete columns in the corridor of the newly built experimental building of Yucai primary school. The perimeter of the columns is 1.884 meters and 5 meters Now we need to paint these columns, 0.5 kg per square meter. How many kg of paint do we need To be 100% right, to explain, please

There are four cylindrical concrete columns in the corridor of the newly built experimental building of Yucai primary school. The perimeter of the columns is 1.884 meters and 5 meters Now we need to paint these columns, 0.5 kg per square meter. How many kg of paint do we need To be 100% right, to explain, please

1.884*3.5*4*0.5=13.188~13.2(kg)

The perimeter of the cylindrical column in Guangming primary school is 3.14 meters. What is the cross-sectional area of this column?

3.14 △ 3.14 △ 2 = 0.5 (m); 3.14 × 0.52, = 3.14 × 0.25, = 0.785 (M2); a: the cross-sectional area of this column is 0.785 m2

The column is 2.5 meters high, with a perimeter of 1.5 meters?

2.5 × 5.2 = 13 square meters