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yes, but through is also correct

ram gend ke dvara khelta hai....in question also it is khelta hai

Use mid point theorem then DF||BC, EF||DB, DE||FC

Thus two parallelograms DECF and DFEB are formed. Then opposite angles of parallelogram are equal so you can easily prove them similar using AA test.Then find ratio.

What to explain.....just simple logic

........without any change in temperature

Current???......not resistance

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