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Given : AD is 1.5 . and AB is 6 .and DE ll BC
To find : DE.
Therom using : Thales therom ( because given that DE ll BC
solution :. first we have to find what is DB
for that BD = AB - AD
that is BD is 4.5
then
as per Thales therom
AD / DB = AE/EC = DE / BC
from this take AD/ DB = DE/BC
then DE is 1.5
I hope you got it
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