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A circumference of 16 decimeters square cardboard, cut into () the largest circle, minus the cardboard has () square decimeters
Cut into (1) largest circle, minus the cardboard has (16-4) square decimeters
The second empty process:
Perimeter △ four sides = side length: 16 △ 4 = (4) decimeters
Area of square = 4 × 4 = (16) square decimeter
If the side length is the diameter of the circle, the radius R is 4 △ 2 = (2) decimeters
So the area of the circle is r squared = (4 V) square decimeters
So the area to cut the cardboard is (16-4) square decimeters
Cut the largest circle on a square paper with a side length of 10 cm. What are the perimeter and area of the circle?
3.14×(10/2) 3.14×10
Draw the largest circle on a square with a side length of 10 cm. What is the circumference of the circle? Fold the paper in half and draw the largest circle
1、 10π
2、 5π
Draw a square with a side length of 2 cm, and then draw the largest circle in the square to find out the circumference of the circle
A square with a side length of 2 cm, and then draw the largest circle in the square. The diameter of the circle is equal to the side length of the square
The circumference of the circle is 2 × 3.14 = 6.28cm
What is the circumference of the largest circle drawn from a square with a side length of 18 cm
If you draw the largest circle in a square with a side length of 18 cm, the diameter of the circle is equal to the side length of the square
So its circumference is 18 * 3.14 = 56.52 cm
Cut the largest circle out of a square with a side length of 10 cm. The circumference of the circle is______ Cm, the area is______ Square centimeter
(1) 3.14 × 10 = 31.4 (CM); (2) 3.14 × (10 △ 2) 2 = 3.14 × 25 = 78.5 (square cm); answer: the circumference of this circle is 31.4 cm, and the area is 78.5 square cm. So the answer is: 31.4, 78.5
Cut out the largest circle on a square paper with a side length of 20 cm. What are the perimeter and area of the circle
On a square paper with a side length of 20 cm, cut out the largest circle with a diameter of 20 cm
Perimeter: 3.14 × 20 = 62.8 cm
Area: 3.14 × (20 △ 2) & sup2; = 314cm2
Cut the largest circle in a square with a side length of 4cm. What is the circumference and area of the circle?
Cut the largest circle in a square with a side length of 4cm. What is the circumference and area of the circle?
The largest circle diameter is 4
Area s = π R * r
=4 π (square centimeter)
Perimeter L = 2 π R
=πd
=4 π (CM)
If the diameter of a circle is 30 cm and the circumference of a square is equal to that of the circle, how many cm is the side length of the square?
4 * 3.14 = 2 * 3.14 * r, r = 2 cm;
S = 3.14 * 22 = 12.56cm2
If the side length of a square is equal to the diameter of a circle, the perimeter of the square must be greater than that of the circle______ (judge right or wrong)
If the diameter of the circle is D, then the side length of the square is also D. the perimeter of the square is 4D, and the perimeter of the circle is 3.14 × d = 3.14d. Because 4D > 3.14d, the answer is: correct
RELATED INFORMATIONS
- 1. Divide a circle into 16 parts averagely and make it into an approximate rectangle. The perimeter of the rectangle is 8 cm longer than that of the original circle. The area of the original circle is______ Square centimeter
- 2. A square with a side length of 5cm has a circumference of () and an area of ()
- 3. The perimeter ratio of a rectangle to a square is 6:5, and the length to width ratio of a rectangle is 7:5. What is the area ratio of the rectangle to the square Don't worry about the equation
- 4. If a square is enlarged by 3:1, its area will be expanded by 3 times______ (judge right or wrong)
- 5. If one side of a rectangle is equal to 3m + 2n and the other side is M-N smaller than it, the perimeter of the rectangle is______ ．
- 6. A rectangular piece of paper 50 cm in length and 25 cm in width is cut off from four corners, and a square 5 cm in length is made into a carton. What is the volume of the carton
- 7. A rectangular sheet of iron is 24 cm long. After subtracting the square with side length of 3 cm from the four corners, it is welded into a rectangular sheet iron box without cover. The volume of the box is 486 cubic cm. How many cm is the width of the original rectangular sheet iron? Good points for giving reasons
- 8. A square iron sheet, four corners, cut off four small squares of the same size, and fold them into a cuboid box with a bottom side length of 50 cm and a volume of 45000 cubic cm. Find out the side length of the original square iron sheet. (use equation solution)
- 9. A 30 cm long, 20 cm wide rectangular cardboard four corners to a side length of 5 cm cube, and then fold along the dotted line into a cuboid What's the volume in cubic centimeters?
- 10. 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?
- 11. When a = 17.4, B = 2.6, the remaining area is () A.289 B.298 C.296 D.269
- 12. How many biggest circles can be cut out on a rectangular paperboard 20 cm long and 2 cm wide? What is the area of each circle? What's the area of the rest?
- 13. Cut the largest circle from a piece of iron 8 decimeters long and 6 decimeters wide. How many square decimeters is the remaining scrap area? If you're right, I'll take 50 extra
- 14. The diameter of a circle is 8 decimeters. Cut it into the largest square. What is the minus area Please explain why
- 15. The circumference of the rectangular abccd is 16 meters. On each side of the rectangular abccd, draw a square with that side as the side length. It is known that the sum of the four squares is 68 Square meter, find the area of ABCD
- 16. How many square decimeters is the area of a rectangle made of two identical squares reduced by 20 centimeters in circumference
- 17. The perimeter of a rectangle is 72 meters. If its width increases by 1 / 4 and its length decreases by 1 / 8, and its perimeter remains the same as the original, what is the area of the rectangle?
- 18. It is known that the perimeter of the sector is 20 cm and the area is 16 square cm. The radius of the sector is calculated
- 19. A is the point of negative one on the number axis. Move a to the left two unit lengths along the number axis to reach B, then the number represented by B is
- 20. The point of - 3 on the number axis is marked as a, the point of 2 is marked as B, and the point of a is marked as a______ Edge movement______ The distance between a and B is______ ．