(Q845088)

English

Pappus's centroid theorem

theorem that, for a solid of revolution of a planar figure, the surface area equals the figure’s perimeter times the distance the perimeter’s centroid travels, and the volume equals the figure’s area times the distance the figure’s centroid travels

  • Pappus–Guldinus theorem
  • Guldinus theorem
  • Pappus's theorem

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Guldin demi cercle.svg
337 × 222; 23 KB
Pappus’ first theorem applied to a sphere: the surface area 𝐴 equals 𝑙 (length of the semicircle) times 𝑝 (distance travelled by the centroid of the semicircle) (English)
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Guldin demi disque.svg
337 × 222; 23 KB
Pappus’ second theorem applied to a ball: the volume 𝑉 equals 𝐴 (area of the half‐disc) times 𝑝 (distance travelled by the centroid of the half‐disc) (English)
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