Special right triangle : , which follows immediately from the Pythagorean theorem. Of all right triangles, the 45°–45°–90° degree triangle has the smallest ratio of the hypotenuse to the sum of the legs, namely . Of all right triangles, the 45°–45°–90° degree triangle has the greatest ratio of the altitude from the hypotenuse to the sum of the legs, namely . Triangles with these angles are the only possible right triangles that are also isosceles triangles in Euclidean geometry. However, in spherical geometry and hyperbolic geometry, there are infinitely many different shapes of right isosceles triangles. This is a triangle whose three angles
Jessie (given name) are Jane/Joan (Sìne), Janie (Sìneag), and Janet/Janice (Seònaid); though spelling may change slightly dependent upon the form of Gaelic (Irish or Scottish). An additional nickname for Jessie, heard in Scotland, is Jinty (or Jinny), a connection to Jean (female given name)/Jane/Jennie. Jessie is as an Anglicisation of the Gaelic root-word of "seas", meaning "to stand". In Irish Gaelige this is Seasaidh/Seasaídh (pro. "Sheh-see", emphasis on first syllable), which uses the fut. aff. conjugation of "seas". The Scots Gàidhlig variant is Seasaidh/Teasaidh/Teasag, (pronounced "Cheh-say"). Jessie (given name) Jessie is a given name in its own right, but may also be a