1 janv. 600 - Bramagupta: Wrote book with ARITHMETIC RULES and had some MISTAKES Wrote formula for area of cyclic quadrilateral (quadrilaterals in circles): - where S = perimeter = a+b+c+d - A = sqrt((s-a)(s-b)(s-c)(s-d)) If d = 0 is area of triangle --> A = sqrt((s-a)(s-b)(s-c)) First to write quadratic formula
Ajouté au bande de temps:
Date:
1 janv. 600
Maintenaint
~ Il y a 1426 ans