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⭕ Circular Ring Calculator
Unit System
Metric (mm, cm, m)
Imperial (in, ft)
Outer Radius
Inner Radius
Calculate Ring Properties
Area of Ring
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Total Perimeter
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Area Formula:
A = π × (R² - r²)
Perimeter Formula:
P = 2πR + 2πr = 2π(R + r)
Where R is outer radius and r is inner radius.
Error: Outer radius must be larger than inner radius