1, the diameter of the bottom surface of the cylinder and the cone is equal, the height of the cone is three times that of the cylinder, the volume of the cone is 12 cubic decimeter, and the volume of the cylinder is (a) cubic decimeter.

① 12 ②36 ③4 ④8

2. The volume of the cone is 12 cubic centimeter, the bottom area is 4 square centimeters, and the height is (c) centimeters.

①3 ②6 ③9 ④ 12

3. The volume of a cone is n cubic centimeters, and the volume of a cylinder with the same height as its bottom surface is (c) cubic centimeters.

① n ②2n ③3n ④ 4 n

4. Cut a section of round steel into the largest cone, and the cut part weighs 8kg. This round steel weighs (a) kilograms.

①24 ② 16 ③ 12 ④8

5. The volume of a cylinder is larger than that of a cone with the same height as its bottom surface (b).

① 1 time ②2 times ③3 times

6, a cone-shaped block with a base diameter of 27 cm and a height of 9 cm, after being divided into two blocks with the same shape and size, the surface area is increased by (b) square centimeters.

①8 1 ②243 ③ 12 1.5 ④ 125.6

7. The height of cylinder and cone is equal, and their volume is 36 cubic decimeter, and the volume of cone is (b) cubic decimeter.

① 12 ②9 ③27 ④24

8. Cut a cube with a length of 4 decimeters into the largest cylinder, and the volume of this cylinder is (a) cubic decimeters.

①50.24 ②64 ③ 12.56 ④200.96

9. Compare the volumes of cylinders, cubes and cuboids with equal bottoms and heights (D)

A.this cube is very big. This cuboid is very big.

C. the cylinder is as big as d.

10, the radius and height of the bottom of the cylinder are enlarged by 3 times, and its volume is enlarged (d).

A.3 B. 6 C.9 D.27

1 1, Party A and Party B respectively roll a rectangular paper with a length of 12.56 cm and a width of 9.42 cm into a cylinder in two different ways (the seams do not overlap), and then roll it into a cylinder (B).

A height must be equal and b lateral area must be equal.

C lateral area is equal to Gao, and D lateral area is not equal to Gao.