6 Answers

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 radius^{2}
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

Surface Area of a Sphere = 4 pi r^{2}
(r is radius of circle)

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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The surface area of a sphere is given by the following formula:
Where r is the radius of the circle

The surface area of a sphere formula:
A= 4 pi r^{2}
(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 = 4pr^{2}
= 4 × 3.14 × 5^{2}
= 314

Let the radius of the sphere be r, then the total surface area of sphere will be A= 4 π r^{2.}
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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