\( A B C D \) is a suqare. \( E \) and \( F \) are respectively the mid-points of \( B C \) and ...

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\( A B C D \) is a suqare. \( E \) and \( F \) are respectively the mid-points of \( B C \) and \( C D \). If \( R \) is the mid-point of \( E F \).
Prove that \( \operatorname{ar}(\triangle A E R)=\operatorname{ar}(\triangle A F R) \).
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