Question 21
In the figure below, $ABCD$ is a rectangle where $E$ in on $CD$ and $F$ is on $BC$ such that $\angle AEF=90^\circ$ and $AF=25$ cm. If the length of $DE,EC,CF,FB,AE$ and $EF$ are all positive integers, what is the area, in cm², of rectangle $ABCD$?
