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A 30 cm long, 20 cm wide rectangular cardboard, cut off the four corners of the small square, you can make a carton without cover, please calculate, how much cubic centimeter is the volume of this carton? What's the surface area?
(30-4 × 2) × (20-4 × 2) × 4 = 22 × 12 × 4 = 1056 (cubic centimeter); 30 × 20-4 × 4 × 4 = 600-64 = 536 (square centimeter); answer: the volume of this carton is 1056 cubic centimeter, and the surface area is 536 square centimeter
After cutting the four corners of a rectangular cardboard 8 cm in length and 6 cm in width from a square 1 cm in side length, the perimeter of the remaining cardboard is () cm and the area is () square cm
Perimeter unchanged: (8 + 6) * 2 = 28
Area: subtract the area of 4 small squares from the original area, 8 * 6-1 * 1 * 4 = 44
The rectangle enclosed with iron wire is 9 decimeters long and the largest square enclosed with iron wire. How many square decimeters is the area of this square
It is 9 decimeters long and 5 decimeters wide
(9+5)*2=28
28/4=7
7*7=49
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If a pair of opposite sides of a square are increased by 2 cm each to become a rectangle, the area will be increased by 16 square cm. What is the original square area______ ．
16 △ 2 = 8 (CM) 8 × 8 = 64 (square cm) answer: the original square area is 64 square cm, so the answer is 64 square cm
The area of a square is 90 square meters. How much is the side length
If the side length is x, then m x * x = 90, x = 3, radical 10 is about 9.49 'A: 9.49m
The area of a square garden is 800 square meters. After expansion, the side length will be increased to three times of the original. What is the area of the square garden now?
800x3x3 = 7200 square meters
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There is a square flower garden in our school. In order to increase the green area, the opposite sides of the flower garden are increased by 2 meters, which increases the area by 36 square meters. How much is the original flower garden area? Please write the formula,
36 divided by two squared, the answer is 324
The increase is the length of the opposite side, not both sides. The area is increased by 36, not changed to 36. So many people who answered the question above answered it for you without understanding it. Have you ever learned the equation? If the equation is used, let the original length be x * 2 = 36, and get x = 18. Then use the area formula, the square of the side length is 18 times 18, which is also the answer 324
There is a square flower bed in China. If the side length is increased by 2 meters, its area will increase by 36 square meters,
2 * 2 * 4 = 16 (square meters) 36-16 = 20 (square meters) 20 / 4 / 2 = 2.5 (meters) a: the original side length of this garden is 2.5 meters
There are 32 trees planted in a square flower garden with four corners around it. The distance between each two trees is 3 meters. How many square meters is the square area?
Remove one tree from each corner of the square, and there are seven trees on each side: (32-4) △ 4 = 7 (trees)
Trees on one side of a square: trees at both ends + trees in the middle, i.e. 2 = 7 = 9 (trees)
There are 8 tree spaces between the nine trees, and the distance between each two trees is 3 meters, so the side length of the square is 8 three meters, that is, 8 × 3 = 24 (meters)
The area of a square is 24 × 24 = 576 (square meters)
There is a square flower bed, the side length increased by 2 meters, the area increased by 10 square meters, how much is the original area
Let the length of the original square be x meters
（x+2)*(x+2)-x*x=10
x*x+2x+2x+4-x*x=10
4x=10-4
x=1.5
1.5 * 1.5 = 2.25 (M2)
A: the original square area is 2.25 square meters
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