Calculate the area of a circle whose radius is 5 dm.

Correct answer:

S =  78.5398 dm2

Step-by-step explanation:

r=5 dm S=π r2=3.1416 52=78.5398 dm2

We will be pleased if You send us any improvements to this math problem. Thank you!


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

Related math problems and questions:

  • Circle area
    circle3 Calculate the circle area with a radius of 1.2 m.
  • Circle - easy 2
    circle_3 The circle has a radius 6 cm. Calculate:
  • Quadrant II
    quartes_circle Calculate the radius of the quadrant, which area is equal to area of circle with radius r = 15 cm.
  • Diagonals of pentagon
    5gon_diagonal Calculate the diagonal length of the regular pentagon: a) inscribed in a circle of radius 12dm; b) a circumscribed circle with a radius of 12dm.
  • 22/7 circle
    red_circle Calculate approximately the area of a circle with radius 20 cm. When calculating π, use 22/7.
  • Circle arc
    pizza Circle segment has a circumference of 135.26 dm and 2096.58 dm2 area. Calculate the radius of the circle and size of the central angle.
  • Radius
    circle_axes Find the radius of the circle with area S = 200 cm².
  • Annulus
    medzikruzie_1 The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
  • Rhombus HP
    rhombus3_1 Calculate area of the rhombus with height 24 dm and perimeter 12 dm.
  • Surface and volume
    cylinder_1 Calculate the surface and volume of a cylinder whose height is 8 dm and the radius of the base circle is 2 dm  
  • Perimeter of the circle
    squares Calculate the perimeter of the circle in dm, whose radius equals the side of the square containing 0.49 dm2?
  • Circle simple
    circles_3 Circumference of a circle is 6.28. What is the area of the circle?
  • Diameter
     circular_plot The diameter of a circular plot is 14 dm. Find the circumference and area.
  • Octagon from rectangle
    8gon From tablecloth rectangular shape with dimensions of 4 dm and 8 dm we cuts down the corners in the shape of isosceles triangles. It thus formed an octagon with area 26 dm2. How many dm2 we cuts down?
  • Perimeter to area
    circles_1 Calculate the area of a circle with a perimeter of 15 meters.
  • Two annuluses
    medzikruzie_2 The area of the annular circle formed by two circles with a common center is 100 cm2. The radius of the outer circle is equal to twice the radius of the inner circle. Determine the outside circle radius in centimeters.
  • Radius of the circle
    circle_axes Calculate the radius of the circle whose length is 107 cm larger than its diameter