There is a batch of coal in the coal yard, which is piled into a cone-shaped coal pile with a bottom radius of 4 meters and a height of 3 meters. If each cubic meter of coal weighs about 1.4 tons, how many tons is this batch of coal? Hello:

Cone bottom area =3. 14×4? =50.24 square meters

Coal pile volume = 1/3×50.24×3=50.24 (m3)

Coal pile weight =50.24× 1.4=70.336 (ton)