60*0.8=48 (meter)
48m = 480m。
20 mm =0.2 decimeter
Bottom area: 3. 14*(0.2/2)?
=3. 14*0. 1?
=3. 14*0.0 1
=0.03 14 (square decimeter)
Volume: 0.0314 * 480 =15.072 (cubic decimeter)
15.072 cubic decimeter = 15.072 liter
A: ...........................