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Arc length of a Semicircle
L = πr
Where: L = Arc length, 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: L (Arc length)
- Formula: L = π·r
- Substitute the values: L = π·7
- Result: L = 21.991149
Answer: L = 21.991149
Calculator
How to calculate Arc length of a Semicircle
- Write down the formula: L = πr.
- Note the known values (r).
- Substitute them and simplify to find L.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Arc length of a Semicircle?
The formula is L = πr, where L = Arc length, r = radius.
What is Arc length of a Semicircle when r = 7?
L = 21.991149. Substitute the values into L = πr and simplify.