if a, b, c and d are four points such that ∠bac = 45° and ∠bdc = 45°, then a, b, c, d are concyclic.
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![if a, b, c and d are four coplanr points, then prove that [a b c]=[b c d] [a b d] [c a d]. | 12 ...](https://i.ytimg.com/vi/yQq4b963CGY/mqdefault.jpg)
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if a, b, c and d are four coplanr points, then prove that [a b c]=[b c d] [a b d] [c a d]. | 12 ...
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