You need at least () cm long wire to make a cuboid frame with a perimeter of 18 cm at the bottom and a height of 5 cm

18 × 2 + 5 × 4 = 56 cm

For a cuboid, the surface area is 368cm2, the bottom area is 40cm2, and the perimeter of the bottom surface is 36cm,

Because the surface area of the cuboid = (L × W + L × H + W × h) × 2, the bottom area = l × w = 40, the perimeter of the bottom surface = (L + W) × 2 = 36, then l + W = 36 △ 2 = 18, according to the meaning of the title, we can get: (L × W + L × H + W × h) × 2 = [40 + (L + W) × h) × 2 = [40 + 18 × H] × 2 = 368

Cut a cylinder with a circumference of 18.84 cm and a height of 10 cm into several equal parts to form an approximate cuboid
What's the square centimeter? What's the cubic centimeter?

The circumference of the bottom of the cylinder is equal to the length of the cuboid, the height of the cylinder is equal to the height of the cuboid, and the radius of the cylinder is equal to the width of the cuboid

As shown in the figure, cut the cylinder with a circumference of 18.84 cm and a height of 10 cm into several equal parts to form an approximate cuboid. What is the surface area and volume of the cuboid? Surface area: Volume:

(1) The radius of the bottom surface is: 18.84 △ 3.14 △ 2 = 3 (CM); the area of the bottom surface is: 3.14 × 32 = 28.26 (cm 2); the surface area is: 18.84 × 10 + 3.14 × 32 × 2 + 10 × 3 × 2, = 188.4 + 56.52 + 60, = 304.92 (cm 2); (3) the volume is: 3.14 × 32 × 10, = 3.14 × 90, = 282.6 (cm 3); a: the surface area of this cuboid is 304.92 cm 2, and the volume is 282.6 Cubic centimeter

As shown in the figure, cut the cylinder with a circumference of 18.84 cm and a height of 10 cm into several equal parts to form an approximate cuboid. What is the surface area and volume of the cuboid? Surface area: Volume:

(1) The bottom radius is 18.84 △ 3.14 △ 2 = 3 (CM); the bottom area is 3.14 × 32 = 28.26 (cm 2); the surface area is 18.84 × 10 + 3.14 × 32 × 2 + 10 × 3 × 2, = 188.4 + 56.52 + 60, = 304.92 (cm 2); (3) the volume is 3.14 × 32 × 10, = 3.14 × 90, =

Cut the cylinder with the circumference of 18.84 cm and the height of 10 cm into several equal parts to form an approximate cuboid. What is the surface area of the cuboid

The bottom area of this cuboid is (9.42 * 3 = 28.26 square centimeter); the volume is (28.26 * 10 = 282.6 cubic centimeter); the surface area is (2 * (9.42 * 3 + 9.42 * 10 + 3 * 10) = 304.92 square centimeter); the half diameter of the bottom is: 18.84 / (2 * 3...)

As shown in the figure, cut the cylinder with a circumference of 18.84 cm and a height of 10 cm into several equal parts to form an approximate cuboid Cm, the surface area is increased Square centimeter, the volume is__ Cubic centimeter

18.84 △ 3.14 △ 2 = 3 (CM), the perimeter of the bottom of the cuboid: 18.84 + 3 × 2 = 18.84 + 6 = 24.84 (CM), the surface area increased: 3 × 10 × 2 = 60 (square cm), the volume is: 3.14 × 32 × 10 = 282.6 (cubic cm), a: the perimeter of the bottom of the cuboid is 24.84 cm, the surface area

There is a rectangular iron sheet, 24cm in length and 18cm in width. After cutting off the same small square at four corners, fold it up to make a uncovered box. If the bottom area of the box is half of the original rectangular area, then the height of the box is______ cm．

Let the height of the box be xcm. From the meaning of the question, we can get 2 (24-2x) (18-2x) = 24 × 18. The solution is x = 3 or x = 18. A: the height of the box is 3cm

Use a 24 cm long and 18 cm wide rectangular sheet iron, cut out the square with the side length of 4 cm on the four corners, and defend it into a box without cover. What is the volume of the box?

Box
Length = 24-4-4 = 16 cm
Width = 18-4-4 = 10 cm
Height = 4cm
Cellar = 16 * 10 * 4 = 640 CC

A 24 cm long, 18 cm wide rectangular sheet iron, cut out the 4 cm square on the four corners, and weld it into a box without cover. What is the surface area and volume of the box?

The length of the box is: 24-4 × 2 = 16 (CM), the width is: 18-4 × 2 = 10 (CM), the height is 4 cm, the surface area of the box is: 24 × 18-4 × 4 × 4, = 432-64, = 368 (square cm), the volume of the box is: 16 × 10 × 4 = 640 (cubic cm); a: the surface area of the box is 368 square cm, the volume is 640 cubic cm

You need at least () cm long wire to make a cuboid frame with a perimeter of 18 cm at the bottom and a height of 5 cm