You will have to measure some part of the circle. As long as you have absolutely no information about a circle, you can't do any calculations.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
If a circle circumference is 30 the radius is: 4.77
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle with a circumference of 59 is: 9.39
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
a protractor
The radius of a circle with a circumference of 110 is: 17.507
The circumference of a circle with a radius of four is: 25.13
The circumference of a circle with a radius of 6.7 is: 42.097
The circumference of a circle with a radius of 11 is: 69.12
If a circle circumference is 30 the radius is: 4.77
A circle with a radius of 4m has a circumference of 25.133m.
The radius of a circle with a circumference of 59 is: 9.39
The circumference of a circle with a 2pi radius is: 39.58