Circumference of Circle
C = 2*pi*r
Definition
Perimeter of a circle equals two times pi times the radius.
Variables
| Symbol | Meaning |
|---|---|
C |
Circumference |
r |
Radius |
Calculator
Circumference
—
cm
Related Formulas
Tangent Perpendicular to Radius
tangent perpendicular radius at point of contact
Area of Sector
A = (theta/360)*pi*r*r
Length of Arc
l = (theta/360)*2*pi*r
Study Tools
Question
Circumference of Circle
Tap to reveal formula
Answer
C = 2*pi*r
Perimeter of a circle equals two times pi times the radius.
Quick Quiz
In Circumference of Circle, what does r represent?
Used In
- Circles
Frequently Viewed Together
Area of Circle
A = pi*r*r
Quadratic Formula
quadratic formula roots
Pythagoras Theorem
c*c = a*a + b*b