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Triangles A B C and D E F are similar...

Triangles `A B C` and `D E F` are similar. If area `( A B C)=36\ c m^2` , area `( D E F)=64\ c m^2` and `D E=6. 2 c m ,` find `A Bdot` (ii) If `A B=1. 2 c m` and `D E=1. 4 c m` , find the ratio of the areas of ` A B C` and ` D E F` .

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