A school is designing a notice board \(ABCD\) in the shape of a quadrilateral where each of its interior angles are \(90^{\circ}\). The lengths of the sides of the quadrilateral are \(AB = (2x + 3) \ cm\), \(BC = (3x - 1) \ cm\), \(CD = (2x + 3) \ cm\), and \(DA = (3x - 1) \ cm\).
1. Identify the type of quadrilateral.
2. If the perimeter is \(54 \ cm\), then the value of \(x\) is
3. The lengths of all \(4\) sides of the notice board \(ABCD\) is
4. The diagonals \(AC\) and \(BD\) intersect at \(O\). If \(AO = 7 \ cm\), then \(AC\) is ____ \(cm\).