1, because it is surrounded by this paper, lateral area is the paper with an area of 6*6=36 square centimeters, the volume is the bottom area multiplied by the height radius R=6/2π= 1 cm, and the volume π* 1*6= 18 cubic centimeters.

2. lateral area 6.28*4=25. 12 Volume π* 1*4= 12 cubic centimeter.

3, there is no clear requirement.

4. Only calculate the surface area. The two bottom areas are the same. One * * is 2*π*0.25= 1.57 square meters. The horizontal area is the perimeter of the ground multiplied by the height π * 1.5 = 4. 17 square meters, so a * * needs iron sheets 10 *.

5. Is the volume the bottom area multiplied by the height π*4? *8=40 1.92 m3 surface area 2*π*4? +π * 8 * 8 =100.48+200.96 = 301.44 m3.

6. Find the side area π * 0.12 * 3 =1.1304 square meters.

7. Find the specific cube size ①π*3? *5=45π ②π*2.5? *6=37.5π π*2.5? *8=50π, so 8 is the maximum height.

8. If you have two more faces after cutting, add them up. The original surface area is 2*π*5? +π* 10*5=3 1.4 square decimeter, and the extra two faces are the same size, so 2* 10*5= 100 square decimeter, so a * * is13/kloc.

9. The volume of rising water is the volume of stone, so 15*0.2=3 square decimeters.

10, equal ratio and equal height? make it clear