Question

prove that the area of a cyclic quadrilateral is (s-a)(s-b)(s-c)(s-d) where a,b,c and d are the sides ..and s the semi-perimeter

Answer 1

http://jwilson.coe.uga.edu/emt725/brahmagupta/brahmagupta.html

Answer 2

thank u very much .!

Answer 3

Google is your friend

Answer 4

just for fun: if you let \(d=0\) you can recover Heron's formula for a triangle

Answer 5

wow .! funny .:P