The first step to calculate circumference of a circle is to know the formula. There are two formulas that can be used for the purpose. They are:
Here are a few illustrations that would make problem solving related to finding the circumference of a circle easy:
Using the Radius:
If the value of the radius is known then it can be put in the 'circumference of a circle equation' already mentioned and the value calculated. For example:
Given that the radius of circle is 3 cm.
Circumference of the circle: C= π x 2 radius
or, C= 3.14 x 2 (3) cm
or, C= 18.84 cm
Using the Diameter:
If the value of the diameter is known it can be directly put in the 'circumference of a circle equation' and the circumference calculated. For example:
Given that the diameter of a circle is 6 cm.
Circumference of the circle: C= π x diameter
or, C= 3.14 x 6 cm
or, C= 18.84 cm
Chat with our AI personalities
If you want an approximate answer, you can measure it with string. If you want an exact answer and know the radius, multiply by 2*pi to find the circumference.
Well, honey, if you want the radius of a circle with a 58 cm circumference, you just divide that by 2π, which gives you approximately 9.22 cm. So, there you have it, darling, the radius of that circle is about 9.22 cm.
I assume you want the circumference which is pi times the diameter, so for 37 inch diameter the circumference would be about 116.24 inches.
The area is 9 feet. You find the square root of 81 which is 9. I want circumference, not area.
Using 3.14 as Pi the area of circle is: 0