Lesson Ideas
Research
Related LinksPatterns and DesignMontessori

Match Regular Polygons
Age: 4 & up Prerequisites: Launching and quitting an application; clicking and dragging; counting with red and blue rods; ability to identify regular polygons in the geometric cabinet. Screen objects: Eight solidly colored polygons down left side of screen. First polygon is an equalateral triangle, second polygon is a square, third polygon is a regular pentagon, etc. At bottom of screen are eight matching polygons placed in random order. All of these polygons are colored blue to match the geometric insets. Next to the left hand column is another column of polygons. These polygons are simply blue outlines. Presentation: (Individual or small group)
Variations: Matching the physical fraction circles to a chart with divided circles on it, counting sectors as they put them over corresponding circles in chart. Matching polygons of various sizes by number of sides. Extensions: Sectors and numerals matching. Making polygons with geometry sticks. Points of Interest: Sticky buttons stay pressed when clicked. Marking items as they are counted. First exposure to sides as components of a polygon. Control of Error: System responds by counting sides when polygon is placed in outline (darkening them and counting out loud). If count does not match number of sides in polygon to its left, the polygon falls back down to the bottom of the screen. Direct Aims: Practice in counting. Introduction to sides of a polygon. Indirect Aims: Preparation for exercises in recognition of external angles of regular polygons. Software Affordance: The counting of the number rods requires teacher verification. This exercise uses control of error to support the child's autonomy. Software Constraints: Unlike the polygons in the geometric cabinet,
the polygons cannot be rotated. Unlike the polygons made of geometry sticks, the
sides of the polygons are rigid and cannot be added or removed. 