1 янв 600 г. - 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
Добавлено на ленту времени:
Дата:
1 янв 600 г.
Сейчас
~ 1426 г назад