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Diameter of a Circle
d = 2r
Where: d = diameter (= 2r), 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: d (diameter (= 2r))
- Formula: d = 2·r
- Substitute the values: d = 2·7
- Result: d = 14
Answer: d = 14
Calculator
How to calculate Diameter of a Circle
- Write down the formula: d = 2r.
- Note the known values (r).
- Substitute them and simplify to find d.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Diameter of a Circle?
The formula is d = 2r, where d = diameter (= 2r), r = radius.
What is Diameter of a Circle when r = 7?
d = 14. Substitute the values into d = 2r and simplify.