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Half-Disk

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HalfDisk

A half-disk is the region bounded by a semicircle and its diameter. It is a circular sector with central angle pi radians (180 degrees). For radius r, its area A, curved arc length s, and total perimeter P are

A=1/2pir^2
(1)
s=pir
(2)
P=(pi+2)r.
(3)

(Kern and Bland 1948, p. 3). A half-disk is also called a semidisk (or semidisc).

See also

Circle, Circular Sector, Disk, Quarter-Disk, Semicircle

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References

Kern, W. F. and Bland, J. R. Solid Mensuration with Proofs, 2nd ed. New York: Wiley, p. 3, 1948.

Cite this as:

Weisstein, Eric W. "Half-Disk." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Half-Disk.html

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