on blurred background of Machu Picchu
A parallelogram is a quadrilateral with two pairs of parallel sides.
Machu Picchu is a 15th-century Inca site located in Cusco, Peru. It stands 2,430 m above sea-level, in the middle of a tropical mountain forest, in an extraordinarily beautiful setting. It was the most amazing urban creation of the Inca Empire.
Machu Picchu is one of the best known and most visited tourist destinations in South America.
and Delaunay Triangulation