There is a cylindrical well with a bottom radius of 1 m in Guanzhong Village, with a depth of 8 m and a water storage depth of 1 at ordinary times. What is the usual storage capacity of this well?

2. A round steel is 5m long with a bottom radius of 4cm. How much does this round steel weigh? (Round steel weighs 7.8kg per cubic decimeter. Keep the whole kilogram)

3. Measured from the inside, the bottom diameter of the cylindrical oil drum is 4 decimeters and the height is 5 decimeters. If 1 cubic decimeter of gasoline weighs 0.69 kilograms, how many kilograms can this oil drum hold?

4. A cylindrical water cup, measured from the inside, has a bottom circumference of 3 1.4cm and a height of 6cm ... What is the volume of this cup?

Jinshan Grain Station has a cylindrical grain depot with a bottom diameter of 8 meters and a height of 6 meters. If the corn weighs 600 kilograms per cubic meter, can this grain depot hold 200 tons of corn?

1)3. 14× 1? × (8× 1/2) = 12.56 (m3)

2)3. 14×0.4? × 50× 7.8 =195.936 ≈196 (kg)

3)3. 14×(4÷2)? × 5× 0.69 = 43.332kg.

4)3. 14×(3 1.4÷3. 14÷2)? × 6 = 47 1 (cubic centimeter)

5)3. 14×(8÷2)? × 6× 600 = 180864 (kg) = 180.864 (ton)

So it can't hold 200 tons of corn.