Calculate
Enter values and calculate.
Result
Formula and method
Arc mode rearranges s = rθ to θ = s ÷ r. Sector mode rearranges A = ½r²θ to θ = 2A ÷ r². θ is calculated in radians and also converted to degrees.
Worked example
Arc length π with radius 1 gives θ = π radians = 180°. Sector area π with radius 1 gives 2π radians = 360°.
Limits and ownership boundary
Inputs must use compatible length or squared-length units. This classroom V1 accepts zero through one full revolution. Existing Arc Length and Sector Area calculators retain forward-solving ownership.