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Pilin

Potongan dari bia gengge membentuk lengkung pilin

Dalam ilmu matematika, pilin atau pintal (bahasa Inggris: spiral) adalah bentuk lengkung yang dimulai dari sebuah titik, bergerak melingkari titik tersebut, tetapi gerakan tersebut semakin lama semakin menjauh dari titik awal.

Spiral dua dimensi

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Spiral 2 dimensi secara mudah dijelaskan menggunakan sistem koordinat polar, di mana radius r adalah fungsi kontinu dari sebuah fungsi monotonik sudut θ (theta).

Beberapa bentuk spiral 2 dimensi termasuk di antaranya:

  • Spiral Archimedean: r = a + bθ
  • Spiral Euler, Spiral Cornu
  • Spiral Fermat: r = θ1/2
  • Spiral Hiperbolik: r = a
  • Spiral Lituus: r = θ-1/2
  • Spiral Logaritmik: r = abθ;
  • Spiral Fibonacci dan Spiral Golden
  • Spiral Theodorus

Referensi

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Pilin
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