Brahmagupta also tried to approximate the value of π and in stanza 40 of his book he mentioned,
The diameter and the square of the radius, each multiplied by 3 are the practical circumference and the area of a circle respectively. The accurate values are the square-roots from the squares of those two multiplied by ten.”
He used √10 ≈ 3.1622….. approximated to 3, as an accurate value of π with an error of less than 1%.
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