Multiple choice question I — task. Mathematics State Board, Class 9.

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1. In the quadrilateral

$ABCD$ ,

$AB = BC$ and

$AD = DC$ . Measure of

$\angle BCD$ is:

$30^\circ$
$72^\circ$
$105^\circ$
$150^\circ$

2.

$ABCD$ is a square, diagonals

$AC$ and

$BD$ meet at

$O$ . The number of pairs of congruent triangles with vertex

$O$ are:

$12$
$4$
$8$
$6$

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