\( \mathrm{ABCD} \) is a rectangle with \( \mathrm{AE}=\mathrm{EF}=\mathrm{FB} \). Calculate \( ...
\( \mathrm{ABCD} \) is a rectangle with \( \mathrm{AE}=\mathrm{EF}=\mathrm{FB} \). Calculate \( \frac{12 \operatorname{ar}[\triangle \mathrm{CEF}]}{\operatorname{ar}[\mathrm{ABCD}]} \) ?
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