12 19 The diagram shows three equal circles of radius 3 cm enclosed by a rubber band such that they touch each other. The straight part of the rubber band is tangential to the radius of the circles. Find, in terms of \( \pi \), the length of the rubber band. \( \qquad \) [3]
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The rubber band consists of three curved parts and three straight parts. Each curved part is a segment of a circle. Show more…
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