Lesson 19 Learning Objectives:
Distinguish polygons from non-polygons
By counting sides and vertices, identify polygons with all equal sides and all equal angles as regular polygons
Identify all other polygons as irregular polygons
Reflect:
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 19 for more reflection questions, real life anchoring, playful explorations and creative invitations.
Can a polygon be regular if it looks kind of squished?
If a shape has four sides but they’re all different lengths, is it still a polygon?
How does a shape change when one side is a little shorter? Does that make it less beautiful? Or just different?
Which shapes are you drawn to. Why or why not?
Math Talk:
What Math Lives Here?
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
What do you notice? How are the shapes grouped? Where might the shapes at the bottom belong? How could you rearrange these shapes differently?
Image by LM and Polypad
