== Formula ==The curve can be obtained by intersecting a sphere of radius formula_1 centered at the origin,:formula_2with the cylinder centered at formula_3 of radius formula_4 given by:formula_5The resulting curve of intersection, formula_6, can be parameterized by formula_7 to give the parametric equation of Viviani's curve::formula_8This is a clelie with formula_9, where formula_10.
Soemu Toyoda je bil rojen v mestu Kitsuki, v japonski prefekturi Oita.