Arc Length Calculator
Enter a circle's radius and central angle to get the arc length, chord length and sector area instantly, with each step shown. Useful for geometry homework, engineering sketches and construction layout work where accurate curved measurements matter.
How to use
- Enter the radius.
- Enter the central angle in degrees.
- The arc length, chord and sector area will be shown with steps.
Note: Formula: arc length s = r x theta, where theta is in radians. To convert degrees to radians, multiply by pi / 180.
Frequently Asked Questions (FAQ)
What do I enter to find an arc length?
Enter the radius of the circle and the central angle in degrees.
What results does the arc length calculator show?
It shows the arc length, the chord length and the sector area, with the calculation steps.
What formula does it use?
Arc length s equals r multiplied by theta, where theta is in radians; degrees are converted to radians by multiplying by pi divided by 180.
What is the difference between arc length and chord length?
Arc length is the distance along the curve of the circle, while chord length is the straight line between the two end points of the arc.
What units are the results in?
The results use the same units as the radius you entered, so enter the radius in cm, metres or inches and the answers match.