M2.5.2 For the adult
Polygons
Is a circle a polygon?
What this chapter teaches
A polygon is a flat, closed shape with straight sides, and it has as many corners as sides. Regular needs equal sides and equal corners; a leaning shape made of equal sticks has equal sides but is not regular.
Three questions to ask
There is no one right wording. Listen for the idea.
- Why is a circle not a polygon?
- How can a shape have four equal sides and still not be regular?
- How many sides will a shape have if it has seven corners, and what is it called?
After the chapter, the learner can
- Name shapes with 3 to 8 straight sides
- Sort polygons by their sides and corners
- Tell a regular polygon from one that is not regular
What they copy into their notebook
A polygon is a flat, closed shape with straight sides. It has as many corners as sides. Regular means equal sides and equal corners.