ɪn ðɪs fˈɔːɹmjʊlə, ðə tˈoːɹəs ɪz fˈɔːɹmd baɪ ɹoʊtˈeɪɾɪŋ ɐ sˈɜːkəl ʌv ɹˈeɪdɪəs ɐ wɪð ɪts sˈɛntɚ fˈɑːloʊɪŋ ɐnˈʌðɚ sˈɜːkəl ʌv ɹˈeɪdɪəs bˈiː nˌɑːt nˌɛsɪsˈɛɹᵻli lˈɑːɹdʒɚ ðˌænə, sˈɛlfˌɪntɚsˈɛkʃən ɪz pɚmˈɪɾᵻd.
In this formula, the torus is formed by rotating a circle of radius a with its center following another circle of radius b (not necessarily larger than a, self-intersection is permitted).