Cylinder volume formula πr? h

h = 25 1.2πx(4/2)？

2. Cone volume formula 1/3 sh

1/3x28.26 x2.5 =23.55

23.55( 10x 0.02)= 1 17.75

3. The way to solve the problem is to subtract the actual volume of coal from the volume of 12 pore.

Cylinder volume formula πr? h

πx( 12/2)？ x9=324π

12 pore volume

πx(2/2)？ x9x 12= 108π

Volume of coal: 324π- 108π=2 16π.

4. The maximum diameter of the inscribed circle of a square is 4dm.

Cylinder volume formula πr? h

πx(4/2)？ x4= 16

5. Investigation unit conversion

1 ml = 1 cm? )

Total volume of toothpaste: 120cm?

Volume for each use: πx(0.5/2)? x2=0. 125π

Daily usage: 0. 125πx2=0.25π.

Available days: 120÷0.25π

6. Solution: The maximum amount of water a bucket can hold is determined by the minimum height.

1 cubic decimeter (dm? ) = 1 liter (liter)

Cylinder volume formula πr? h

πx(4/2)？ x5=20π