Contrary to popular opinion, the four fundamental operations (addition, subtraction, multiplication and division) did not appear first in Brahmasputha Siddhanta, but they were already known by the Sumerians at least 2500 BC.
In some of the verses before verse 40, Brahmagupta gives constructions of various figures with arbitrary sides.
He essentially manipulated right triangles to produce isosceles triangles, scalene triangles, rectangles, isosceles trapezoids, isosceles trapezoids with three equal sides, and a scalene cyclic quadrilateral.
The representation of numbers in a positional system.
Numbers were not written in figures, but in words and were organized in verses.
Eg. The number 1 was given as moon, since it exists only once; the number 2 was represented by wings, twins, or eyes, since they always occur in pairs; the number 5 was given by the (5) senses.
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