This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionWooden pattern blocks dodecagon.JPG
English: A dodecagon made of wooden pattern blocks. These are mathematics teaching materials ("manipulatives"): there are six different shapes: square, hexagon, a thin rhombus, a fat rhombus, an equilateral triangle and a trapezium (US: trapezoid). All have the same unit length.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.