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If you cut a cube with an edge length of 9 decimeters into three identical cuboids, the surface area of each cuboid is () square decimeters A. 162B. 270C. 243
9 △ 3 = 3 (decimeter), so the edge length of the cut cuboid is: 9 decimeter, 9 decimeter, 3 decimeter, then the surface area of each cuboid is: (9 × 9 + 9 × 3 + 9 × 3) × 2, = 135 × 2, = 270 (square decimeter), so B
The bottom of the cuboid is a square with a side length of 3 decimeters and a height of 12 decimeters. The surface area of the cuboid is () square decimeters
2*(3*3+3*12+3*12)=2*(9+36+36)=2*81=162
After three cubes of the same size are put together into a cuboid, the surface area of the cuboid is reduced by 114cm. What's the surface area of the cuboid?
We should introduce in detail what we are looking for in each step
Three cuboids are spliced together, a total of four square faces are missing, each square is 28.5, and the cuboid has 14 such faces, 28.5 * 14 = 399
What is the area of a square with a circumference of 25.12 cm
Think like this: 1. The diameter of the circle: 25.12 △ 3.14 = 8 (CM) 2. A diagonal line connecting the square. In this way, the square is divided into two triangles with the diameter as the bottom and the radius as the height. 3. The area of the square: 8 × (8 △ 2) △ 2 × 2 = 32 (square cm) 4. In addition, two diagonal lines can be connected to divide the square into two triangles with the diameter as the bottom and the radius as the height
RELATED INFORMATIONS
- 1. In a circle with a circumference of 25.12 cm, draw the largest square, the square area is___ Square centimeter
- 2. If the perimeter of a right triangle is 48 cm and the sum of the sides of two right angles is 28 cm, the area of the triangle can be calculated?
- 3. 1. The ratio of length to width of a rectangle is 7:3. If the width is increased by 16cm, the rectangle will become a square. The area of the original rectangle is () CM & # 2. Agricultural science research is a rectangular experimental field. This experimental field is 32 meters long and 20 meters wide. There are two roads in the middle, one is rectangular and the other is parallelogram. How large is the planting area of this experimental field?
- 4. On a circular iron plate with a radius of 20cm, cut a rectangle with the largest area and the length twice the width, and calculate the area and perimeter of the rectangle
- 5. Use a 60cm long iron wire to form a rectangle. The ratio of length to width is 3:2. What is the area of the rectangle in cm2?
- 6. A rectangle with a length of 5cm and a width of 3cm is enlarged by 3:1 to get the length of () cm, the width of () cm and the area of () cm2
- 7. To make a rectangular frame of 8cm long, 6cm wide and 5cm high, at least () cm iron wire should be used. If the frame is wrapped with colored paper, at least () cm iron wire should be used How many square centimeters of colored paper?
- 8. Use two cubes with 5cm edges to make a cuboid. The sum of the edges of the cuboid is () cm. Please write the formula!
- 9. A cuboid is 10 cm long, 8 cm wide and 6 cm high. Its surface area is? Cm square and its volume is? Cm cubic Formula
- 10. There is a cuboid with a square bottom. If the height is increased by 5cm, it will be a square, and the surface area is increased by 200cm2. What are the surface area and volume of the cuboid
- 11. The surface area of a cuboid is 178dm, and its two sides are 3DM long squares. What is the volume of the cuboid?
- 12. 1. Make a cuboid with six small cubes whose edges are 2cm long. The surface area of the cuboid is () CM & # 178;, and the volume is () CM & # 179 2. In a rectangle, draw a line segment and divide it into a maximum isosceles right triangle and a trapezoid
- 13. Three identical cubes are used to form a cuboid. The surface area of the cuboid is 84dm2. The surface area of the original cube is 84dm2______ dm2．
- 14. The diameter of a circle and the side length of a square are both equal to 8 cm. Who is the larger of the area of a circle and that of a square fast
- 15. If the circumference of a circle is equal to that of a square, the area of the circle is larger than that of the square______ (judge right or wrong)
- 16. As shown in the figure, put a circular shear with a radius of 10cm into an approximate rectangle, and the perimeter of the current rectangle is () cm A. 31.4B. 62.8C. 72.8 D、82.8
- 17. In a 8 cm long, 5 cm wide rectangular cardboard cut a largest circle, circle area is______ Square decimeter
- 18. Cut the largest circle in a rectangle 5cm long and 4cm wide. The area of the circle is () square centimeter. The perimeter is the remaining area of () cm It's () square centimeter
- 19. Cut out the largest circle in the rectangle with a length of 10cm and a width of 8cm. What is the area and perimeter of the circle
- 20. Put a circle into an approximate rectangle, increase the circumference by 4cm, then the circumference of the circle is (), and the area is ()