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Cut a piece of paper with an area of 8 square decimeters into the largest circle. What's the area of this circle?
A square with an area of 8 square decimeters needs to be cut into a circle, that is, the maximum diameter of the circle is square 8, and the area of the circle is π * 8 / 4 = 2 π square decimeters
A chocolate box, four sides of the total area is 12 square decimeters, the bottom is a side length of 2 decimeters square. What is the volume of the box?
Height = 12 (2 × 4) = 1.5 decimeters
Volume = 2 × 2 × 1.5 = 6 cubic decimeter
RELATED INFORMATIONS
- 1. The area of a square is 16 square decimeters. How many square decimeters is the square area now?
- 2. Use a piece of square paper with a side length of 2 decimeters to form an empty cylinder. The circumference of the bottom surface of the cylinder is______ Decimeter, height is______ Decimeter, side area is______ Square decimeter
- 3. A piece of cardboard 1.2 meters long and 70 cm wide is cut into a round teaching aid with a diameter of 30 cm. How many pieces can be cut at most?
- 4. Mr. Wang is going to use a cardboard to make a column. The following is the design drawing. Can you calculate the surface area of the column? The coloring part can't be added to the picture. Let me dictate it [a rectangle with a dotted line on the right and two circles and shadow parts in the dotted line. The width of the rectangle is 4 decimeters, right]
- 5. Cut the square cardboard with side length of 20cm into four small squares of the same size. How many centimeters is the circumference of each small square
- 6. Cut a piece of square paper with a side length of 36 cm into four identical small rectangular pieces. The sum of the circumference of the four small rectangular pieces is larger than that of the original square How many centimeters has the circumference increased?
- 7. The right side of a right triangle is divided into 40 cm and 10 cm. Cut out a square and make it as large as possible. What is the square area Sorry, wrong number. Change the word "person" to "person", Can you solve it arithmetically?
- 8. The two right sides of a right triangle are 30cm and 40cm long, and the hypotenuse is 50cm long. The area of this triangle is______ Square centimeter
- 9. Cut the largest square from the sheet iron of a right triangle. What's the area of the square? (40 meters at the bottom) 40 / 10 = 4 40 * 10 / 2 / (1 + 4) = 40 (M2) 40 * 2 / 10 = 8 (m) 8 * 8 = 64 (m)
- 10. Cut a square on the sheet iron of a right triangle (bottom 40, height 10). The area of the square is as large as possible. How about the area of the square?
- 11. If the side length of a square increases by 50 cm, the area will increase by 135 square meters. How many square meters is the original square area
- 12. A square, length and width increased by 50 decimeters, area increased by 135 square meters, square area The bull man, help
- 13. Use a piece of rectangular paper 15 cm long and 7 cm wide to cut out the largest square. What is the area of the largest square? How many square centimeters are left?
- 14. There is a rectangular paper 20 cm long and 15 cm wide. Cut the largest square. What is the area of the square
- 15. A piece of rectangular paper is 36 cm long and 20 cm wide. Fold the paper into the largest square. What is the square area?
- 16. Use a 15 cm long, 12 cm wide rectangular paper to cut the largest square. What is the area of the cut part?
- 17. The perimeter of a square is 16 decimeters in 25. How many square decimeters is its area?
- 18. The bottom of a cuboid is a square with a perimeter of 8dm, and its surface area is 20 square decimeters
- 19. The perimeter of a square is 2.4 decimeters, and its area is () square meters
- 20. The area of a rectangular land is 36 square meters, its width is 40 decimeters, how many decimeters is the length of this land?