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Correct option is A)

$BC=AC_{2}−AB_{2} $

$BC=15_{2}−9_{2} $

$BC=12cm$

$DE$ = $2BC =212 =6cm$

D is the mid point of the side AB

D is the mid point of the side AB

AD = $2AB =29 =4.5cm$

$Areaof△ADE=21 ×AD×DE=21 ×4.5×6=13.5cm_{2}$

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