The perimeters of two similar triangles are 30 cm and 20 cm respectively. If one side of the first triangle is 9 cm long, find the length of the corresponding side of the second triangle.

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Step 1: Let the side of other triangle be $x$ cm. Ratio of perimeters of two similar triangles is equal to ratio of their corresponding sides
Step 2: $	herefore \frac{9}{x} = \frac{30}{20} \Rightarrow x = 6$ cm

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