Polygons and Non-Examples: Classify and Explain
Apply the polygon definition to a set of figures and explain which rule each non-example fails to meet.
- Grades
- Grades 2–5
- Pages
- 1
- File type
- Subject
- Geometry, Math
- Resource types
- Worksheets, Worksheets & Printables
From the author
About this resource
Apply the polygon definition to a set of figures and explain which rule each non-example fails to meet.
- A written definition listing polygon criteria
- A set of shapes and nonexamples to classify
- Reasoning spaces for explaining rejected figures
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In the classroom
Teaching tips & learning objectives
Learning objectives
- Apply closure, straight-side, and crossing-line criteria
- Explain which defining property a nonexample lacks
Teaching tips
- Underline each condition in the definition before examining the figures.
- Require explanations to name a specific failed criterion rather than only saying not a polygon.
Skills covered
- Definition-based classification — test each figure against closure and straight-side requirements and explain a failed criterion.
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Resource details
Core concepts
Core concepts
Core concepts
- Polygons
- Closed straight-sided shapes
- Nonexamples
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