In the unit square ABCD the points P, Q, R, S
are the midpoints of the sides. What is the ratio between the area
of the smaller square JKLM and the area of the square ABCD?
2.
(A general problem) In the unit square ABCD the points P, Q, R, S on th
sides such that the proportions AP:AD = DS:DC = CR:CB = BQ:BA = a. What is the ratio between the area
of the square JKLM and the area of the square ABCD?
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