8250 cubic decimeters? 5.3 cubic decimeters? 8.7 liters? 3 1 liter 400 ml.

Equal circle, surface.

Countless, 1.

1536.04 cubic centimeters.

75.36 square meters.

Cone, height, bottom radius, 2π b.

18840 cm2.

0.9 cubic decimeter.

18.84 cm.

25 1.2 cubic centimeter.

1 1.775 cubic meters.

3 centimeters.

Third,

3. Let the side length of the cube be a and the height of the cylinder be h, π=3. 14, then: ∵a=h=d, ∴πa? /4*a=628cm？ ,∴a？ =800cm？ . The volume of this box is 800 cubic centimeters.

4.2/3*36/6=4dm, a: milk is 4 decimeters deep.

5.3.14 * 0.4 * 0.6 *100 = 45.2 16kg, a: 45.216kg of paint is required.

6.50 * 20 *10/(100 * 3.14) ≈ 32cm, a: the height of cylindrical steel column is 32cm.

7.750 * 3.14 *1.5+750 * 3.14 * 0.6 ÷ 3 = 4003.5 kg. This granary can hold 4003.5 kilograms of grain.