2007 Cyprus MO/Lyceum/Problem 14

Problem

In square $ABCD$ the segment $KB$ equals a side of the square. The ratio of areas $\frac{S_1}{S_2}$ is

$\mathrm{(A) \ } \frac{1}{3}\qquad \mathrm{(B) \ } \frac{2}{3}\qquad \mathrm{(C) \ } \frac{1}{\sqrt{2}}\qquad \mathrm{(D) \ } \sqrt2-1\qquad \mathrm{(E) \ } \frac{\sqrt{2}}4$

Solution

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2007 Cyprus MO, Lyceum (Problems)
Preceded by Problem 13	Followed by Problem 15
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2007 Cyprus MO/Lyceum/Problem 14

Problem

Solution

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