\( \triangle \mathrm{ABC} \sim \triangle \mathrm{DEF}, \mathrm{AB}=5 \mathrm{~cm} \), area \( (\...
\( \triangle \mathrm{ABC} \sim \triangle \mathrm{DEF}, \mathrm{AB}=5 \mathrm{~cm} \), area \( (\triangle \mathrm{ABC})=20 \mathrm{sq} \).
\( \mathrm{cm} \), area \( (\triangle \mathrm{DEF})=45 \) sq. \( \mathrm{cm} . \mathrm{DE} \) is equal to
a. \( 5.5 \mathrm{~cm} \)
b. \( 5.7 \mathrm{~cm} \)
c. \( 7.5 \mathrm{~cm} \)
d. \( 8.5 \mathrm{~cm} \)
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