| Circle geometry is something we all learned in | | | | number pi (pi is what's called an irrational number in that |
| elementary school and middle school, but many of us | | | | its digits go on forever, but it can be approximated by |
| forgot later. Not to worry, the basics are quite simple | | | | the number 3.1415926). |
| to master. | | | | The circumference, the distance around a circle or the |
| First, a circle is a shape that is formed by tracing a | | | | length of the line that makes up a circle, is also simple |
| continuous line the same distance from a single point (a | | | | to calculate and does not involve squaring any |
| circle's center point). That distance is called a radius. | | | | numbers like finding the area of a circle does. All you |
| Once you know the radius (the only measurement you | | | | have to do to find the circumference is multiply the |
| need to know in order to draw a circle), you are able | | | | radius by two and multiply that quantity by the number |
| to calculate the diameter, area and circumference of | | | | pi. This is also the same as saying that you should |
| that circle. This is great news, as these are the most | | | | multiply the diameter of a circle by the number pi, as |
| common attributes people desire to know. | | | | diameter is twice the radius, as explained above. |
| Determining the diameter of a circle is easy. All you | | | | It's that simple. Circle geometry, though you might have |
| have to do is multiply the radius by two. Yes, twice the | | | | learned it awhile ago and forgotten it, is not difficult to |
| radius is the diameter. | | | | master. There are lots of tools online to make learning |
| Now, the area of a circle is a bit more difficult to | | | | about circles easy. There are even tools that will |
| calculate, but it is still easy. Square the radius (the | | | | calculate the main circle geometry quantities for you |
| radius multiplied by itself) and multiply that by the | | | | once you enter the radius of a circle. |