Circumference of a 21 Centimeter Diameter Circle
What is the circumference of a circle with a diameter of 21 cm? How far around is a circle that is 21 centimeters across?
Diameter
cm
Diameter
ft
in
Diameter
meters
Units
Circumference of a 21cm diameter circle
65.973 | centimeters |
0.65973 | meters |
2.1645 | feet |
25.974 | inches |
2′ 1.974″ | feet and inches |
results may be rounded
Circumference of a Circle Formula
The circumference of a circle is pi times its diameter.
Circumference = π * Diameter
Diameter of a Circle
The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.