The areas of two similar triangles `A B C` and `P Q R` are in the ratio `9: 16` . If `B C=4. 5 c m` , find the length of `Q R` .
The areas of two similar triangles `A B C` and `P Q R` are in the ratio `9: 16` . If `B C=4. 5 c m` , find the length of `Q R` .
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