Euler Triangle Formula

Let and be the Circumcenter and Incenter of a Triangle with Circumradius and Inradius . Let be the distance between and . Then

• Helmholtz Differential Equation--Parabolic Cylindrical Coordinates
• Helmholtz Differential Equation Polar Coordinates
• Helmholtz Differential Equation--Prolate Spheroidal Coordinates
• Helmholtz Differential Equation--Spherical Coordinates
• Helmholtz Differential Equation--Spherical Surface
• Helmholtz Differential Equation--Toroidal Coordinates
• Helmholtz's Theorem
• Helson-Szegö Measure
• Hemicylindrical Function
• Hemisphere
• Hemispherical Function
• Hempel's Paradox
• Hendecagon
• Henneberg's Minimal Surface
• Hensel's Lemma
• Henstock-Kurzweil Integral
• Heptacontagon
• Heptadecagon
• Heptagon
• Heptagonal Number
• Heptagonal Pyramidal Number
• Heptahedron
• Heptakaidecagon
• Heptaparallelohedron
• Heptomino