Perimeter of the circle

Calculate the perimeter of the circle in dm, whose radius equals the side of the square containing 0.49 dm2?

Result

o =  4.398 dm

Solution:

S=0.49 dm2 a=S=0.49=710=0.7 dm  r=a=0.7=710=0.7 dm  o=2π⋅ r=2⋅ 3.1416⋅ 0.7≐4.3982≐4.398 dmS=0.49 \ \text{dm}^2 \ \\ a=\sqrt{ S }=\sqrt{ 0.49 }=\dfrac{ 7 }{ 10 }=0.7 \ \text{dm} \ \\ \ \\ r=a=0.7=\dfrac{ 7 }{ 10 }=0.7 \ \text{dm} \ \\ \ \\ o=2 \pi \cdot \ r=2 \cdot \ 3.1416 \cdot \ 0.7 \doteq 4.3982 \doteq 4.398 \ \text{dm}

Try another example


Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!





Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




You need to know the following knowledge to solve this word math problem:


 
We encourage you to watch this tutorial video on this math problem: video1

Next similar math problems:

  1. Four circles
    circles_2 1) Calculate the circle radius if its area is 400 cm square 2) Calculate the radius of the circle whose circumference is 400 cm. 3) Calculate circle circumference if its area is 400 cm square 4) Calculate the circle's area if perimeter 400 cm.
  2. Circle r,D
    bavlnka Calculate the diameter and radius of the circle if it has length 52.45 cm.
  3. Area to perimeter
    circle11_3 Calculate circle circumference if its area is 254.34cm2
  4. Circle - simple
    colorful-circle Calculate the area of a circle in dm2, if its circumference is 31.4 cm.
  5. Perimeter to area
    circles_1 Calculate the area of a circle with the perimeter 15 meters.
  6. Find the
    kruh Find the radius of the circular base of the vessel, whose perimeter is 2.51 m. Write the result to one decimal place in meters. Via the π sign - Ludolph's number
  7. Circle
    circle_1 What is the radius of the circle whose perimeter is 6 cm?
  8. Radius
    green_circle Determine the radius of the circle, if its perimeter and area is the same number.
  9. Mine
    minetower Wheel in traction tower has a diameter 4 m. How many meters will perform an elevator cabin if wheel rotates in the same direction 89 times?
  10. Flowerbed
    garden_16 In the park there is a large circular flowerbed with a diameter of 12 m. Jakub circulated him ten times and the smaller Vojtoseven times. How many meters each went by and how many meters did Jakub run more than Vojta?
  11. Rhombus 4
    diamond_shape Circumference of the rhombus is 44 cm, its height is 89 mm long. Calculate its content area.
  12. Cross five
    5squares2 The figure on the picture is composed of the same squares and has a content of 45cm². What's its perimeter?
  13. Playground
    plot_ihrisko.JPG Fencing square playground cost € 464; 1 meter cost € 19. What is the area of the playground?
  14. Cable
    wire Cable consists of 8 strands, each strand consists of 12 wires with diameter d = 0.5 mm. Calculate the cross-section of the cable.
  15. Lawns
    grass Before a sports hall are two equally large rectangular lawns, each measuring 40 m and 12 m. Maintenance of 10m² lawn cost 45 CZK yearly. On each lawn is circular flowerbed with a diameter 8 meters. How much money is needed each year to take on lawn care?
  16. Diameter
    circles2_1 What is the inside diameter of the cylinder container and if half a liter of water reaches a height 15 cm?
  17. Simplify 2
    expr Simplify expression: 5ab-7+3ba-9