BRAHMA GUPTA
Brahma Gupta was born in 598A.D in Pakistan.
He gave four methods of multiplication.
He gave the following formula, used in G.P series
a + ar + ar2 + ar3 +……….. + arn-1 = (arn-1) ÷ (r – 1)
He gave the following formulae :
Area of a cyclic quadrilateral with side a, b, c, d= √(s -a)(s- b)(s -c)(s- d)where 2s = a + b + c + d
Length of its diagonals =
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