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1. In the quadrilateral \(ABCD\), \(AB = BC\) and \(AD = DC\). Measure of \(\angle BCD\) is:
 
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2. \(ABCD\) is a square, diagonals \(AC\) and \(BD\) meet at \(O\). The number of pairs of congruent triangles with vertex \(O\) are:
 
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