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Question Number 84899 by Power last updated on 17/Mar/20

Commented by Tony Lin last updated on 17/Mar/20

$$A\left(ADE\right)=9$$$$\Rightarrow h=6$$$$A\left(EFC\right)$$$$=\frac{1}{2}\times EC\times \left(h\times \frac{6}{7}\right)$$$$=\frac{1}{2}\times 6\times \frac{36}{7}$$$$=\frac{108}{7}$$

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