Increase: 5×2×8=80cm?
There is a cylindrical glass cylinder with a bottom diameter of 2 decimeters, and there is no water in it. Put an iron ball in it. When the iron ball completely sinks into the water and the water level rises by 3 cm, find the volume of the iron ball.
The volume of the ball =(2÷2)? ×3. 14×3=9.42cm? ;
3. Enclose a cylindrical grain depot with a piece of iron sheet with a length of 28.26 meters and a width of 4 meters (joints are ignored). What is the volume of this grain depot?
Maximum bottom radius = 28.26. 3. 14÷2 = 4.5m;
Volume =4.5? ×3. 14×4=364.5m? ;
4. The bottom radius of the cylindrical barrel is 20cm. After taking out a small stone from the bucket (the stone is completely immersed in water), the water in the bucket drops 1cm. What is the volume of this small stone?
Stone volume =20? ×3. 14× 1 = 1256cm?