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

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1. If the diagonals of a rhombus are equal, then the rhombus is a:

Parallelogram but not a rectangle
Rectangle but not a square
Parallelogram but not a square
Square

2. If the bisectors of \(\angle A\) and \(\angle B\) of a quadrilateral \(ABCD\) meet at \(O\), then \(\angle AOB\) is:

$∠ C + ∠ D$
$\frac{1}{2} ∠ C + \frac{1}{3} ∠ D$
$\frac{1}{3} ∠ C + \frac{1}{2} ∠ D$
$\frac{1}{2} (∠ C + ∠ D)$

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