The tangram (seven boards of skill) is a dissection puzzle consisting of seven flat polygons, called tans, which are put together to form shapes. The objective is to replicate a pattern (given only an outline), using all seven pieces without overlap. Alternatively, the tans can be used to create original minimalist designs that are either appreciated for their inherent aesthetic merits or as the basis for challenging others to replicate its outline.
It is reputed to have been invented in China somewhere around the late 18th century and then carried over to America and Europe by trading ships shortly after. It became very popular in Europe for a time and then again during World War I. It is one of the most widely recognized dissection puzzles in the world and has been used for various purposes including amusement, art and education.
You will need to recreate the following tangram to discover the combination needed to open the lock and sign the log.
Please place all pieces back as found so that the next cacher can appreciate the cache in the way that the cache owner intended.