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Brahmagupta's formula
In
geometry
,
Brahmagupta's formula
gives the
area
of a
cyclic quadrilateral
whose sides have lengths
a
,
b
,
c
,
d
as:
where s=(a+b+c+d)/2.
Heron's formula
for the area of a
triangle
is the special case obtained by taking
d
=0.