If A, B, C and D are four points such that `angleBAC=45^(@) and angleBDC=45^(@)`, then A, B, C and D are concyclic.
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Since, `angleBAC=45^(@) and angleBDC=45^(@)` As we know, angles in the same segment of a circle are equal.Hence, A, B, C and D are concyclic.
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