1. The bottom radius of a cylinder is 2 cm, the height is 10 cm, and its side area is () square cm 1. The bottom radius of a cylinder is 2 cm, the height is 10 cm, and its side area is () square cm 2. Cut a cylinder with a base area of 6.28 square centimeter into two cylinders of the same size, and increase the surface area () 3. If the side area of a cylinder is 240 square centimeters and the height is 5 centimeters, then the circumference of the bottom surface of the cylinder is () 4. The volume of a cylinder is 15 cubic decimeters, and that of a cone is () 5. If a cone has a base area of 24 square decimeters and a height of 30 centimeters, then the volume of the cone is () 6. The side area of a cylinder is 125.6 square centimeters, the height is 8 centimeters, the circumference of the bottom surface is () centimeters, the radius of the bottom surface is () centimeters, the bottom area is (), and the surface area is () 7. The surface area of a cylinder is 153 square meters, the side area is 78 square meters, and the area of a bottom surface is ()

1. The bottom radius of a cylinder is 2 cm, the height is 10 cm, and its side area is () square cm 1. The bottom radius of a cylinder is 2 cm, the height is 10 cm, and its side area is () square cm 2. Cut a cylinder with a base area of 6.28 square centimeter into two cylinders of the same size, and increase the surface area () 3. If the side area of a cylinder is 240 square centimeters and the height is 5 centimeters, then the circumference of the bottom surface of the cylinder is () 4. The volume of a cylinder is 15 cubic decimeters, and that of a cone is () 5. If a cone has a base area of 24 square decimeters and a height of 30 centimeters, then the volume of the cone is () 6. The side area of a cylinder is 125.6 square centimeters, the height is 8 centimeters, the circumference of the bottom surface is () centimeters, the radius of the bottom surface is () centimeters, the bottom area is (), and the surface area is () 7. The surface area of a cylinder is 153 square meters, the side area is 78 square meters, and the area of a bottom surface is ()

1. Side area = bottom perimeter × height, and bottom perimeter = diameter × 3.14
2×2×3.14×10
＝12.56×10
＝125.6﹙㎝²﹚
2. Two bottom areas are added
6.28×2＝12.56﹙㎝²﹚
3. Perimeter of bottom surface = side area △ height, i.e
240÷5＝48﹙㎝﹚
4、15÷3＝5﹙dm³﹚
5. The volume of the cone = one third of the bottom area × height, that is: (30 cm in the question is 3 decimeters)
24×3÷3
＝24﹙dm³﹚
6. The perimeter of the bottom surface is: 125.6 △ 8 = 15.7 (CM)
The bottom radius is: 15.7 △ 3.14 △ 2 = 2.5 (CM)
The bottom area is: 2.5 × 2.5 × 3.14 = 19.625 (cm-178;)
The surface area is (surface area = side area + bottom area × 2) 125.6 + 19.625 × 2
＝125.6﹢39.25
＝164.85﹙㎝²﹚
7、153÷78÷2≈0.98﹙㎡﹚
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