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The perimeters of two similar triangles are $25$ cm and $15$ cm respectively. If one side of the first triangle is $9$ cm, then the length of the corresponding side of the second triangle is :
- (a)$5.4$ cm
- (b)$6.8$ cm
- (c)$2.5$ cm
- (d)$4$ cm
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(A) $5.4$ cm