So, you want to know just how big that circle you are looking at is. You wonder to yourself just how I am going to be able to figure this out and be accurate without a mathematician to aid me in my quest. It is not nearly as complex as one would imagine with a few simple straight-line measurements.
Instructions
Perimeter of a Circle
1. Start by finding the diameter of the circle. The diameter of a circle is the longest straight line that you can measure along a circle from one point to another. Once you have determined the length of the diameter of the circle you will be better able to determine what the circumference or perimeter of the circle is.
2. Use the diameter of the circle that you have acquired to aid you in the determination of the perimeter of the circle. You will take the diameter of the circle that you have and you will then multiply it by the value pi. The value of pi is a given at 3.14 in most cases and in its simplest form, if you would like to be more accurate you can carry it out to more decimal places if you like.
3. Apply the information to determine the circumference or diameter through examples. If the diameter of the circle is 15 and then you multiply that by pi or 3.14 you will get a distance of 47.1 units as a perimeter. Make sure that you use the proper units when you state the answer that you get for the problem.
4. Determine if the length that you have in your problem is a radius or a diameter. If it is a radii it will need doubled or multiply it by 2 in order to get the right answer for your problem about the perimeter of the circle.
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