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Circumference (perimeter) of a Circle
C = 2πr = πd
Where: C = Circumference (perimeter), r = radius
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: r = 7
Find: C (Circumference (perimeter))
- Formula: C = 2·π·r
- Substitute the values: C = 2·π·7
- Result: C = 43.982297
Answer: C = 43.982297
Calculator
How to calculate Circumference (perimeter) of a Circle
- Write down the formula: C = 2πr = πd.
- Note the known values (r).
- Substitute them and simplify to find C.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Circumference (perimeter) of a Circle?
The formula is C = 2πr = πd, where C = Circumference (perimeter), r = radius.
What is Circumference (perimeter) of a Circle when r = 7?
C = 43.982297. Substitute the values into C = 2πr = πd and simplify.