Radius

Find the radius of the circle with area S = 200 cm².

Correct result:

r =  7.979 cm

Solution:

S=200 cm2 S=πr2  r=S/π=200/3.1416=7.979 cmS=200 \ \text{cm}^2 \ \\ S=\pi r^2 \ \\ \ \\ r=\sqrt{ S/\pi }=\sqrt{ 200/3.1416 }=7.979 \ \text{cm}



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




Tips to related online calculators

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

Next similar math problems:

  • Circle area
    circle3 Calculate the circle area with a radius of 1.2 m.
  • 22/7 circle
    red_circle Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
  • Two circles
    two_circles Two circles with a radius 4 cm and 3 cm have a center distance 0.5cm. How many common points have these circles?
  • Annulus
    medzikruzie_1 The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
  • Circle - easy 2
    circle_3 The circle has a radius 6 cm. Calculate:
  • Bicycle wheel
    cyklo2_2 After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm?
  • Diameter to area
    circle_eq_1 Find the area of a circle whose diameter is 26cm.
  • Height to the base
    triangle The triangle area is 35 cm ^ 2. The size of the base is 10 cm. Find the length of height to the base.
  • Perimeter to area
    circles_1 Calculate the area of a circle with the perimeter 15 meters.
  • 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.
  • Sidewalk
    kruhovy-objazd The city park is a circular bed of flowers with a diameter of 8 meters, around it the whole length is 1 meter wide sidewalk . What is the sidewalk area?
  • Shape
    some_airplane Plane shape has a maximum area 677 mm2. Calculate its perimeter if perimeter is the smallest possible.
  • Two machines
    machine_2 Performances of two machines are in a ratio of 7:12. A machine with less power produced 406 pieces of products per shift. a) How many pieces produced per shift second machine? b) How many pieces produced two machines together for five shifts?
  • 7 triangle
    coloured_triangle The triangle area is 26.7 cm2. Determine the side length l if appropriate height hl = 45.3 cm.
  • Expression
    expr_2 Solve for a specified variable: P=a+4b+3c, for a
  • Simplify
    numbers3_1 Simplify the following problem and express as a decimal: 5.68-[5-(2.69+5.65-3.89) /0.5]
  • Hotel
    hotel The hotel has a p floors each floor has i rooms from which the third are single and the others are double. Represents the number of beds in hotel.