In the following figure (not to scale), \( C_{1} \) and \( C_{2} \)...

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In the following figure (not to scale), \( C_{1} \) and \( C_{2} \) are two congruent circles with centres \( O_{1} \) and
W \( \mathrm{O}_{2} \). respectively. Each circle passes through the centre of the other circle. If the circumference of each circle is \( 2 \mathrm{~cm} \), the perimeter of the shaded region is \( \mathrm{cm} \).
(a) \( \frac{4}{3} \)
(b) 1
(c) \( \frac{5}{3} \)
(d) \( \frac{2}{3} \)
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