[MA2019] (0) 21 :
21. Analyze and compare two- and three-dimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts (number of sides and vertices or "corners"), and other attributes.
Example: Having sides of equal length. [MA2019] (0) 23 :
23. Use simple shapes to compose larger shapes.
Example: Join two triangles with full sides touching to make a rectangle.