Triangle and Square

Author: mathforces
Problem has been solved: 54 times

Русский язык | English Language

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 $EDC$.