It should be remembered that the Shulbasutras of different Sutrakaras have slight variations thus we see versions of the above angula measures.
+
It gives us an insight about how our ancients developed units of measurement long before other civilizations mentioned it. However, it should also be remembered that the Shulbasutras of different Sutrakaras have slight variations thus we see versions of the above angula measures. It cannot be more emphasized that later day developments in such areas of ganita are founded on these ancient works.