Lesson 3: Polygon Attributes

Getting Started

Questions to Explore

  • What attributes do polygons have?
  • How can we use what we know about attributes to identify and create polygons?

Facts and Definitions

  • Side: a line that makes part of a shape or polygon
  • Angle: the space created inside a shape where the sides meet
  • Vertex: the point where two sides of a shape or polygon meet
  • Regular: a shape that has sides that are all the same length
  • Irregular: a shape that has sides that are NOT all the same length

Skills

  • Recognize and create shapes having specified attributes, such as a given number of angles
  • Identify the parts of polygons
  • Distinguish regular and irregular shapes

Materials

  • The Greedy Triangle by Marilyn Burns
  • addition flashcards (kit)
  • colored pencils or markers
  • construction paper (kit)
  • fine point dry-erase marker (kit)
  • geoboard (kit)
  • glue
  • Interactive Notebook (kit)
  • number cards (kit)
  • rubber bands (kit)
  • scissors
  • subtraction flashcards (kit)
  • whiteboard (kit)

Introduction

Materials: addition flashcards (kit), subtraction flashcards (kit)
Say: "I'm a four-sided polygon, and all my sides are the same length. What am I?" (square) Discuss your child's guess, whether it's right or wrong. "How do you know? Why can't I be a rectangle?"

Ask your child to count from 40 to 80 by 2s. Then, give your child 10 more random addition and subtraction flashcards, and ask her to continue the process of determining which ones she knows that she started in Lesson 1. Ask her to also review the ones she didn't know from the previous lesson.