2
Votes

How do I find the surface area of a sphere

By Ryan McGuire on the 10th of January, 2013

6 Answers

  • 1
    Vote

    To find the surface area you first need to know the radius (this is the distance from the centre to the outside, or half the diameter). For the sake of this example, lets assume the radius is 5cm.

    Then you need to use this equation:

    4 x pi x radius2

    pi is an infinite number but at this level you can consider it to be 3.142

    5 squared means 5 * 5 which equals 25

    So the equation is 4 x 3.142 x 25

    So the answer would be 314.2 cm

     

     

    Refine By henry warren on the 15th of January, 2013

  • 1
    Vote

    Surface Area of a Sphere = 4 pi r2

                                           (r is radius of circle)

    Surface area of a sphere

    Sphere

     

    Refine By Dawn Lubka on the 15th of January, 2013

  • 1
    Vote

    Surface area of sphere is given below as:

    A = 4 x (Pie) x R2

    A=SURFACE AREA

    PIE= 3.1417

    R=RADIUS OF SPHERE

     
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    Refine By AMRITA CHAKRAVARTY on the 21st of January, 2013

  • 0
    Vote

    The surface area of a sphere is given by the following formula: 

    A = 4\pi r^2.

    Where r is the radius of the circle

    Refine By jagadish on the 14th of January, 2013

  • 0
    Vote

    The surface area of a sphere formula:

    A= 4 pi r2

    (r is radius of circle)

     

    Example 1  if 'r' = 5 for a given sphere, and p = 3.14, then the surface area of the sphere is:

     

    surface area = 4pr2

             = 4 × 3.14 × 52

             = 314

     

     

     

    Refine By Bridget Gaskin on the 17th of January, 2013

  • 0
    Vote

    Let the radius of the sphere be r, then the total surface area of sphere will be A= 4 π r2.

    Refine By Adersh Antony on the 19th of January, 2013

Suggested reading…

Calculate the surface areas of cylinders, cones and spheres

How do I find surface area of spheres, cones and cylinders?

Just use these simple equations;

Formula for Surface Area :

Cylinder = 2πr² + 2πrL  (L is the length of the cylinder)

Cone = πr² + πrL   (L is the length from the point of the cone to the edge of the base)

Sphere = 4πr2

 

 

 

 

 

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