CALCULATOR
Semicircle Area Calculator
Find half-disk area. Example: Radius: 2 m gives 6.28318530718 m². Exactly 180-degree sector. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation.
Exactly 180-degree sector. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: Half full disk area.
Accepted inputs: Radius: 0.001 to 1,000 m.
How the calculation works
A = πr²/2
Worked example
With radius 2 m, half-disk area is 6.283185307 m².
Assumptions and limits
Exactly 180-degree sector. Flat Euclidean geometry; enter stated meter measurements. No material thickness, waste, structural recommendation or curved earth. Display rounding does not change calculation. Derivation: Half full disk area.