Brahmagupta (598–668 CE) was an Indian mathematician and astronomer who wrote many important works on mathematics and astronomy.His famous work was Bhramasphuta-siddhanta.Its 25 chapters contain several unprecedented mathematical results.

So that the approximate value of the area of this cyclic quadrilateral will be letting it the exact value of the area is

The approximate area is the product of the halves of the sums of the sides and opposite sides of a triangle and a quadrilateral. The accurate [area] is the square root from the product of the halves of the sums of the sides diminished by [each] side of the quadrilateral

**Brahmagupta's Formula:**So that the approximate value of the area of this cyclic quadrilateral will be letting it the exact value of the area is

**Statement:**The approximate area is the product of the halves of the sums of the sides and opposite sides of a triangle and a quadrilateral. The accurate [area] is the square root from the product of the halves of the sums of the sides diminished by [each] side of the quadrilateral

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