There is a 18cm wide rectangular iron plate. After cutting the square with 4cm side length at the four corners, it is welded into an iron box without feeding. The known volume of the iron box is 760 cubic cm How many square centimeters is the original iron plate area?

Bottom area: 760 △ 4 = 190 square cm
Length of cuboid: 190 ÷ (18-4-4) = 19cm
Length of rectangle: 19 + 4 + 4 = 27 cm
Original iron plate area: 27 × 18 = 486 square centimeters

Cut off the four corners of a square iron plate with a side length of 12 cm and a small square with a side length of 3 cm to form a cuboid. How many milliliters of water can it hold

Height of cuboid: 3cm
Length and width of cuboid: 12-2 × 3 = 6cm
Cuboid volume: 3 × 6 × 6 = 108 cubic centimeter
108 CC = 108 ml
Attention! 1 cc = 1 ml, not 1 cc = 1000 ml!

A square iron plate with a side length of 2.4 decimeters, a small square is removed from each corner, and the rest is welded into a square container without a cover. What is the floor area of this container?

If you think that the length, width and height of a square are equal, and the area of each face is equal, and that it has five faces (i.e. no cover), plus the minus four corners, you will get nine. Then the area of each face is 2.4 * 2.4/9 = 0.64, which is the floor area

If the radius of the sector is doubled and the central angle of the circle is reduced to half of the original, what will happen to the area of the sector

Doubled

The perimeter of a square garden is 160 meters. If you add 10 meters on one side and 20 meters on the other, how many square meters will the area increase

160÷4=40(m)
40 × 40 = 1600 (square of M)
40+10=50（m)
40+20=60（m)
50 × 60 = 3000 (m square)
3000-1600 = 1400 (m square)
A: then the area will be increased by 1400 square meters

The length and width of a rectangle are the whole centimeter, and its area is 408 square decimeters

The area is 408 square decimeters, isn't it square centimeter
Let the length be x and the width be X-7
x(x-7)=408
x^2-7x-408
(x-24)(x-17)=0
It is 24 in length and 17 in width
The perimeter is (24 + 17) * 2 = 82

The length of a square rectangle is 8 cm. After reducing 6 cm, the area will be reduced by 24 square decimeters. What are the original area and perimeter of this rectangle

"478881356": Hello
Will the area be reduced by 24 square centimeters (not 24 square decimeters)?
(1) Width of rectangle: 24cm & # 178; △ 6cm = 4cm (4cm)
(2) Original area of rectangle: 8cm × 4cm = 32cm & # 178; (32cm2)
(3) Original circumference of rectangle: (8 + 4) cm × 2 = 24cm (24cm)
Is that right? Good luck. Goodbye

The perimeter of a square is 24 meters, and its side length is M, what's its area Square meters

(1) (2) 6 × 6 = 36 square meters. A: the area is 36 square meters. So the answer is: 6, 36

A square has a side length of two fifths of a meter. How many meters is its perimeter? How many square meters is its area?

Perimeter is: 2 / 5 times 4 equals 8 / 5, that is, 1 and 3 / 5 area is 4 / 25 square meters

The side length of a square is three fourths, its perimeter is several meters, and its area is several square meters

It has a circumference of 3 and an area of 9 / 16

There is a 18cm wide rectangular iron plate. After cutting the square with 4cm side length at the four corners, it is welded into an iron box without feeding. The known volume of the iron box is 760 cubic cm How many square centimeters is the original iron plate area?