Figure 1 shows a trapezium which has a perimeter of $96\text{ cm}$ . Jiayu joins three such trapeziums to form Figure 2 which has a perimeter of $204\text{ cm}$ . (b) Jiayu joins another four such trapeziums to form Figure 3 which has an area of $1932\text{ cm}^2$ . Find the length of RS.

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