Спіраль Архімеда

Три витки на 360° однієї гілки спіралі Архімеда

Спіраль Архімеда — крива, яку описує точка M під час її рівномірного руху зі швидкістю v уздовж прямої, що рівномірно обертається у площині навколо однієї зі своїх точок О із кутовою швидкістю ω. Спіраль названо ім'ям Архімеда, який вивчив її властивості.

Якщо в початковий момент руху точки М і О збігаються, а полярна вісь збігається з початковим розташуванням рухомої прямої, то рівняння спіралі Архімеда у полярних координатах має вигляд ρ = аω.

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