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`        Please tell me the answer of question 2. I am in need.  `
5 months ago

```							ok so first off lets understand the meaning of mean proportional. if c is a mean proportional between a and b, then c^2= ab. it is basically the same as geometric mean.that means ED^2= AE*AD. let AE= a and ED= b then b^2= a(a+b) or b/a= 1+(a/b)= k (say)now, NBF is similar to NED by AA criterion (as sides of parallelogram are parallel and transversal properties).so NB/NE= BF/ED but BF=AE (opposite sides of parallelogram are equal)or NB/NE= a/b or NE= (b/a)*NB= kNBalso MED is similar to MBC by AA.so ME/MB= ED/BC= b/(a+b) or MB= (1+a/b)ME= kMEnow, NE= NB+BE and MB= ME+BE so that NE – MB= NB – MEwe substitute NE and MB from abovekNB – kME=NB – MEor k(NB – ME)= NB – MEor (NB – ME)(k – 1)=0obviously k cannot be 1 else a=b which would imply k=1+1/1= 2. since 1 cannont be equal to 2, hence k is not 1.so, cancelling k – 1 both sidesNB – ME= 0or NB= MEkindly approve :)
```
5 months ago
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