What concepts do children learn by doing constructions? Explain and provide specific examples. Could construction be used as an assessment of their understanding?

Children learn a lot from doing constructions. A construction is drawing shapes accurately without a template, using only various tools (like a compass, a ruler, and a pencil). One of the most fundamental things they learn in this process is the connection between angles and shapes. By doing constructions, a child can learn that the sum of the angles in a certain shape equal specific values. They can also learn that the longer the line you draw on a shape, the larger the angle opposite it must be.
Additionally, constructions help younger children with recognizing shapes and using specific tools. Those tools are very useful in the fields of engineering, architecture, landscaping, and others, so they are actually very practical to begin using frequently.
Construction can certainly help children assess their understanding of certain mathematical concepts as well as their ability to use those tools properly.