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Circle and Sphere

circle:
radius = r
diameter = 2 ⋅ r
perimeter = 2 ⋅ π ⋅ r
area = π ⋅ r2

sphere:
surface area = 4 ⋅ π ⋅ r2
volume
= 4/3 ⋅ π ⋅ r3


Rounding: significant digits.
Decimal sign:

This is a converter for lengths, areas, and volumes of circles and spheres.

Usage: Type the value you want to convert into the respective field. Click on any free space of the window or on the "calculate"-button and read the result. Use the "reset" button to delete your calculation. The units change in correspondance to the input values (cm, cm2, cm3 or m, m2, m3 etc.).

Example: The radius of a sphere is 5 feet. What is its volume ? Type "5" into the field for the radius. Click on any free space of the window or on the "calculate"-button. Read the result for the volume of the sphere (523.6 cu ft).

Remarks:
- Please note the remarks about the representation of numbers..
- There is no warranty for the calculation. Cactus2000 is not responsible for damage of any kind caused by wrong results.
- Please send an email if you have suggestions or if you would like to see more conversions to be included.

© Bernd Krüger, 05.03.2001, 24.10.2018

 
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Bernd Krüger, 2018
Cactus2000