In the given parallelogram ABCD, if AB = 24 cm, AD = 18 cm
and Df =15cm,find DE
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AB=24
AD=18
DF=15
ar(ABCD)=AD×DF
=18×15
=270cm^2 (i)
ar(ABCD)=AB×DE
=24×DE (ii)
from eq. (i) and (ii)
270=24×DE
DE=270÷24
=11.25 cm
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