quadrilaterial in circles
Geometry
Level
2
abcd is a cyclic quadrilateral
ab x cd +ad x bc = ?
(ac x bd)^2
ac x bd +2
ac + bd +ab^2 + 2cd
ac x bd
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Ptolmey's states that the product of both diagonals(on a cyclic quad.)=the product of 1 pair opposite sides +the product of both the other opposite sides