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The areas of two similar triangles A...

The areas of two similar triangles ` A B C` and ` D E F` are `144\ c m^2` and `81\ c m^2` respectively. If the longest side of larger ` A B C` be 36 cm, then the longest side of the smallest triangle ` D E F` is (a) 20cm (b) 26cm (c) 27cm (d) 30cm

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