Presek torusa
Presek torusa je presek ravnine s torusom. Podobno so stožnice preseki ravnine in stožca.
Enačba preseka
Presek torusa je ravninska krivulja četrte stopnje z obliko
- .
Perzejev duh
Posebni primer preseka torusa je Perzejev duh. V njem je presečna ravnina vzporedna z rotacijsko osjo simetrije torusa. Ostali primeri vključujejo hipopedo in Cassinijevo jajčnico s sorodnimi krivuljami kot je Bernoullijeva lemniskata.
Villarceaujeva krožnica
Posebni primer sta tudi Villarceaujevi krožnici v katerih dobimo kot presek enaki krožnici.
Posplošitev preseka torusa
Mnogo bolj komplicirane oblike (npr. kolobar) dobimo, če je presečna ravnina pravokotna ali poševna glede na simetrijsko os vrtenja pri torusu.
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