[1][2] According to Charles Laisant, Born in Bassano del Grappa in 1803 to Ernesto Bellavitis and Giovanna Navarini, Giusto studied largely alone.

In 1840, he entered Institut Venitian and in 1842 began instructing at Lycee de Vicence.

With the unification of Italy he took the opportunity to revise the curriculum to include complementary algebra and analytic geometry.

Two line segments AB and CD are equipollent if they are parallel and have the same length and direction.

According to Laissant, Bellavitis published works in "arithmetic, algebra, geometry, infinitesimal calculus, probability, mechanics, physics, astronomy, chemistry, mineralogy, geodesy, geography, telegraphy, social science, philosophy, and literature.