A square sheet of iron, four corners cut off four small squares, folded into a bottom side length of 40cm uncovered cuboid box, its volume is 24000cm3______ cm．

A square sheet of iron, four corners cut off four small squares, folded into a bottom side length of 40cm uncovered cuboid box, its volume is 24000cm3______ cm．

Let the side length of the cut small square be xcm. 40 × 40 × x = 24000, and the solution is x = 15. The side length of the original square is 40 + 2 × 15 = 70, so the answer is 70

Cut out four identical squares at the four corners of a square sheet of iron, and fold them into a cuboid box without cover. If the folded box is a single body
Is a volume of 27cm3 cube, find the square sheet of iron area

If the stack is a cube, its side length is 3cm, so the side length of the original square iron sheet is 3 times 3, which is equal to 9cm, and the area of the square iron sheet is equal to 81 square centimeters
If it refers to a cuboid with the same low side, the number of combinations of the low side and the high side of the cuboid is infinite. It should be because the problem is wrong or there are few conditions

A square with a side length of 10 cm has the largest circle. For the rest, you can calculate the perimeter and area of the shadow

Perimeter of shadow = square + circle
=10 × 4 + 3.14 × 10 = 71.4cm
The area of shadow part is 10 × 10-3.14 × (10 / 2) & 178; = 21.5 square centimeter

The perimeter of a rectangle is 28cm. If the length is reduced by 1 / 4 and the width is increased by 1 / 3, the perimeter remains unchanged. What is the area of the rectangle?

If the length of the rectangle is xcm, the width is (28 / 2-x) = (14-x) cm
Because the length decreases by 1 / 4 and the width increases by 1 / 3, while the perimeter remains unchanged, the width of 1 / 4x = 1 / 3 (14-x) x = 8cm is 14-8 = 6cm
Then area = length * width = 8 * 6 = 48 square centimeter

The circumference of a rectangle is 36 cm, its width is 1 / 5 of its length, and its area is () square cm
Scores must be expressed in Chinese characters!

Girth 36
So length + width is 36 / 2 = 18
The width is one fifth of the length
The length is five times the width
Then length + width = 5 width + width = 6 width = 18
That's three centimeters wide
It's 15 centimeters long
The area is 3x15 = 45 square centimeters