1.

(i)If in a A ABC, a line DE || BC, intersects AB in D and AC in E, then:AB /AD = AC/AEPROOF :From the basic proportionality theorem, we haveAD/ DB =AE/EC1+DB/ EC= 1 +AD /AEAD + DB /AD= AE + EC/AEAB/AD =AC/AEmy question is why we are adding 1 to both side​ in step second

Answer»

Answer:

Adding both side wont CHANGE the VALUE but this makes our way towards our destination i.e. our proofe ..

on adding 1 we next do ADDITION by LCM method nd hence we GET our ques prooved...

hope it HELPS u ...

IF STILL NOT UNDERSTOOD COMMENT DOWN I'LL CLARIFY IT..

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