If the perimeter of a diamond is 20cm and the length of a diagonal is 8cm, its area is______ .
As shown in the figure, the perimeter of diamond shaped ABCD is 20cm, AC = 8cm. ∵ ABCD is diamond shaped, ∵ AB = BC = CD = Da = 20 △ 4 = 5 (CM), Ao = AC △ 2 = 4 (CM), ∠ AOB = 90 °. ∵ Bo = 52 − 42 = 3 (CM), BD = 2BO = 6 (CM) ∵ sabcd = 12ac · BD = 12 × 8 × 6 = 24 (cm2)
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- 1. If the perimeter of a diamond is 20cm and the length of a diagonal is 8cm, what is its area?
- 2. If the perimeter of a diamond is 20cm and the ratio of two diagonals is 4:3, the area of the diamond is () A. 12cm2B. 24cm2C. 48cm2D. 96cm2
- 3. Cut a round piece of paper and put it together into an approximate rectangle with the width equal to the radius and the area equal. The circumference of the rectangle is 24.84 cm. It turns out that 24.84 △ 2 = the sum of length and width of 12.42 cm, which is also the sum of half of radius and circumference 12.42 (1 + 3.14) = 3cm, which is the radius Area of circle: 3.14 × 3 & # 178; = 28.26 square centimeter Tell me why
- 4. After a circular piece of paper is cut, it is assembled into an approximate rectangle with the width equal to the radius and the area equal. The perimeter of this rectangle is 24.84 cm. How many square meters is this?
- 5. After cutting a round piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area equal. The circumference of the rectangle is 16.56 cm, which is cut What is the area of the round paper
- 6. After cutting a circular piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area unchanged. The perimeter of the rectangle is 16.56 cm. What is the area of the cut circular piece of paper in square cm?
- 7. After cutting a circular piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area unchanged. The perimeter of the rectangle is 16.56 cm. What is the area of the cut circular piece of paper in square cm?
- 8. The perimeter of a rectangle is 24 cm, and the ratio of length to width is 2:1. How many square centimeters is the area of the rectangle?
- 9. The area of a rectangle is 24 square centimeters, the ratio of length to width is 3:2, and the circumference is () centimeters 2. A is 8 / 9 of B, the ratio of B to C is 6:7, and the ratio of a, B and C is () 3. The rectangle is divided into three triangles: A, B and C. the area of a is 12 square centimeters more than that of B, and the ratio of B to C is 2:3. How many square centimeters is the area of this rectangle? 4. For two engineering teams, if one fifth of the number of team a is transferred to team B, and then one sixth of the number of team B is transferred to team a, then the number of the two teams is equal. What is the ratio of the number of team a and team B? To calculate the formula, I am very satisfied with it!
- 10. The ratio of length to width of a rectangle is 2:3, and its circumference is 24 cm. What is the area of the rectangle in square meters
- 11. If the perimeter of the diamond is 24 & nbsp; cm and an inner angle is 60 °, the area of the diamond is 40______ cm2.
- 12. If the perimeter of the diamond is 40 and an internal angle is 120 degrees, the area of the diamond is 40
- 13. If a diamond has an area of 50 square centimeters and an angle of 30 degrees, its circumference is - cm?
- 14. If the sum of two diagonals of a diamond is 10cm and the area is 12cm2, the perimeter of the diamond is___ cm.
- 15. What is the area of the largest circle in a square with a side length of 10 cm?
- 16. What is the area of the largest square cut from a 10 cm round sheet iron? Explain why
- 17. Cut the biggest square out of a 10 cm circle. What's the area of the square sheet?
- 18. Cut the largest circle from a square iron sheet with a side length of 10 cm. What's the circumference of the circle? What's the area? What's the area of the remaining sheet
- 19. Cut the largest circle in a square paper with a side length of 10 cm. What is the area of the circle______ Square centimeter, it takes up half of the square area______ %.
- 20. Cut a circular sheet of iron with a radius of 2 decimeters into the largest square. What is the area of this square in square decimeters The process is to draw a square in a circle, not a circle in a square