Sector area
Find the area of a circular sector from its angle.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
A = (θ/360)πr²
Variables & units
- Radius
- cm · minimum 0, maximum 1000000000
- Central angle
- ° · minimum 0, maximum 360
Worked example
Radius 3 cm and central angle 60° give approximately 4.712389 cm².
Assumptions
Enter the angle in degrees, between 0° and 360°.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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