A simple triangle convinces a "shapeshifter" to make him into a quadrilateral, and then a pentagonbut more angles make things more complicated! "An offbeat introduction to geometry."SLJ
Common Core Alignment:
2.G.A.1 Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.