Exemplar Exercise Problems II — task. Mathematics CBSE, Class 9.

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1. \(ABCD\) is a rhombus such that \(∠ACB = 40^o\). Then \(∠ADB\) is

\(50^{\circ}\)
\(60^{\circ}\)
\(45^{\circ}\)
\(40^{\circ}\)

2. The quadrilateral formed by joining the mid-points of the sides of a quadrilateral \(PQRS\), taken in order, is a rectangle, if

\(PQRS\) is a parallelogram
diagnols of \(PQRS\) are perpendicular
diagnols of \(PQRS\) are equal
\(PQRS\) is a rectangle

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