△ ABC ~△ PQR . If AM and PN are altitud...

`△ ABC` ~`△ PQR` . If AM and PN are altitudes of `△ ABC` and `△ PQR` respectively and `AB^(2) : PQ^(2) =4:9 `, then AM:PN =
(a) 16:81 (b) 4:9
(c) 3:2 (d) 2:3

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