Question 178
the square $ABCD$ Be a rhombus with a sharp angle $A$. the points $M$ and $N$ like so on the routes $AC$ and $BC$ be in place that $|DM| = |MN|$. further be $P$ The intersection of $AC$ and $DN$ as well as $R$ The intersection of $AB$ and $DM$. Prove that $|RP| = |PD|$.