Two marks exercise problems IV — task. Mathematics State Board, Class 9.

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1. \(S = \{\) square, rectangle, circle, rhombus, triangle\(\}\) list the elements of the following subset of \(S\).

(i) The set of shapes which have \(4\) equal sides \(=\)

(ii) The set of shapes which have no sides \(=\)

(iii) The set of shapes in which the sum of all interior angles is \(180^\circ\) \(=\)

(iv) The set of shapes which have \(5\) sides \(=\)

2. If \(A = \{a, \{a, b\}\}\) write all the subsets of \(A\).

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7. Two marks exercise problems IV