orthocenter wanted, parallelogram and rhombus related
Source: Tournament of Towns, Junior O-Level Paper, Spring 2020 , p3
June 3, 2020
geometryrhombusparallelogramorthocenter
Problem Statement
Let be a rhombus, let be a parallelogram such that the point lies inside it and the side is equal to the side of the rhombus. Prove that is the orthocenter of the triangle .Egor Bakaev