Areas and perimeters

Sphere calculator

Input a radius in the field below and you get the volume and surface area of the sphere calculated:

Radius (use at least 1)

radius

Surface area
0

Volume
0

Volume / surface area

 


Geometry

Surface areas and volumes

Spheres

There are 3 quantities of interest in a sphere:radius, surface area and volume.

The surface area is given by 4 π r 2

The volume is given by 4/3 π r 3

radius 10

surface area 1257

volume 4189

 

radius 2.5

surface area 79

volume 65

 

 

 

 

 

 

 

 

The numbers above show that as the radius of a sphere is increased, the volume increases much more than the surface area.

Use the sphere calculator (on the top right) to check that yourself, by inputing various radiuses.

Implications for biology >>

 

 

© Ricardo Esplugas. 2016