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Mathematics 24 Online
OpenStudy (anonymous):

The base of a triangular piece of paper $ABC$ is 12 cm long. The paper is folded down over the base, with the crease $DE$ parallel to the base of the paper. The area of the triangle that projects below the base is $16\%$ that of the area of the triangle $ABC$. What is the length of $DE$, in cm?

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