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Label a box of cube shape with 15cm edge length. What's the area of the label;
15×15×4
=225×4
=900 square centimeters
If a ring has an inner diameter of 5cm and an outer radius of 9cm, what is the area of the ring in square centimeters?
9 × 9 × 3.14-5 × 5 × 3.14 = 175.84 square centimeter
The outer diameter of a ring is 10 cm, the inner diameter is 8 cm, and its area is () square centimeter
The outer diameter of a ring is 10 cm, the inner diameter is 8 cm, and its area is () square centimeter
π(10/2)^2-π（8/2)^2=9π
RELATED INFORMATIONS
- 1. Find the surface area and volume of the following figure. (1) the height of a rectangle is 20cm, the length is 15cm, and the width is 10cm
- 2. The diameter of the inner circle of the ring is 10 cm, and the diameter of the outer circle is 16 cm. Calculate the area of the part of the ring cut along the two radii with an angle of 60 °
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- 4. Length 60cm, width 15cm, weight 108G. What is the diameter?
- 5. A cylinder with a bottom diameter of 10 cm and a height of 15 cm is cut into two half cylinders along the diameter. What is the surface area of a half cylinder
- 6. Cut a cone in half along the height perpendicular to the bottom, and the surface area increases by 36.1 square centimeters. The known height of the cone is 9 cm. What is the original volume of the cone?
- 7. 1. The bottom area of a cone is 8cm in diameter and 12cm in height. How many square centimeters does the surface area increase when it is cut in two vertically along the bottom diameter?
- 8. Cut a cone with a base radius of 5cm into two parts vertically from the top along the height. At this time, the surface area will be increased by 180cm2, and the volume will be calculated
- 9. 1. A cylinder with a bottom diameter of 10 cm and a height of 15 cm is cut into two and a half cylinders along the diameter 1. A cylinder with a diameter of 10cm at the bottom and a height of 15cm is cut into two half cylinders along the diameter. How many square centimeters does the surface area of the two half cylinders increase compared with that of the original cylinder? 2. A cylindrical oil barrel, full of oil, poured out 3 / 4 of the oil in the barrel, and there are 20 liters left. The height of the oil barrel is 8 decimeters. How many square decimeters is the bottom area of the oil barrel? 3. A cylindrical tank contains 10 cm deep water, and the bottom area of the tank is 300 square cm? 4. After sawing a 2-meter-long log into equal segments for three times, the surface area increases by 48 square centimeters. What is the original volume of the log?
- 10. It is known that the side lengths of two bottom surfaces of a regular triangular pyramid are 30cm and 20cm respectively, and the side area is equal to the sum of the two bottom areas
- 11. Draw the largest circle on a rectangle of 15cm in length and 10cm in width. Its diameter is [] cm and its area is [] cm
- 12. The side area of a cylinder is 37.68 square decimeters. The diameter of the bottom surface is 6 decimeters. Find the surface area of the cylinder
- 13. If a cylinder and a cone are of equal height and equal ground, the difference between their volumes is 0.16 cubic decimeter, then the volume of the cylinder is
- 14. The volume of a cone with equal base and height is 6.8 cubic decimeters less than that of a cylinder. The volume of a cone is () cubic decimeters. What is the volume of a cylinder? Why Explain why it's like this. Come on
- 15. Cut a cylinder into the largest cone. The volume of the cone is 42 cubic decimeters. The volume of the cylinder is ()
- 16. There is a cylindrical bucket with a diameter of 8 cm. There is 15 cm deep water in the shengnuguo bucket, which just takes up more than the volume of the bucket milliliter
- 17. There are two cylindrical buckets. The bottom radius of bucket A is 8 cm, and that of bucket B is 6 cm. Bucket A has no water and bucket B is 25 cm high. Pour some water from bucket a to bucket B Then the height of two buckets of water is the same, and the height of a bucket is calculated
- 18. The capacity of this bucket used to be 28.26 liters. There was a hole 3 cm away from the bucket mouth. The diameter of the bucket is 3 decimeters. How many liters of water can this bucket hold now?
- 19. One cubic meter of buoyancy A metal block with a volume of 0.1 cubic decimeter is hung under the spring scale. If the metal block is immersed in water, the indication of the spring scale is 6.8n, calculate the buoyancy of the metal block and the gravity of the metal block (G is 10N / kg)
- 20. 51.75 cubic decimeter = how many kilograms