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Triangle and Square

Author: mathforces
Problem has been solved: 46 times

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Given a square $ ABCD $ with an area of 100. An isosceles triangle $ EDC $ has base $ CD $. It turned out that the area of the common part of $ EDC $ and $ ABCD $ is 80. Find the length of the perpendicular dropped to $ CD $ in the triangle $ EDC $.





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