Polygons Worksheet
This polygons worksheet asks 3rd graders to label six figures polygon or not a polygon, name four polygons from a word bank, and explain their reasoning. Answer key included for quick, no-prep geometry practice.
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About this resource
Description
A polygon is a closed, two-dimensional shape built from straight sides that meet at vertices and never cross. Learning to spot one is the foundation of third grade geometry, and this polygons worksheet gives students a clear, repeatable test to apply: is the shape closed, are all of its sides straight, and do any of those sides cross each other? Once children can answer those three questions with confidence, naming triangles, quadrilaterals, pentagons, hexagons, and octagons follows naturally.
This printable 3rd grade geometry worksheet moves through three short parts. In Part A, students fill in a bubble to label six figures polygon or not a polygon, including a circle, a shape with crossing sides, and a figure that is left open. In Part B, they name four polygons using a word bank that holds one extra word on purpose. In Part C, they write short explanations that justify their thinking in their own words.
What’s Included
- 1 print-ready PDF worksheet
- Answer key
- 6 polygon or not-a-polygon bubble items, 4 name-the-polygon items with a word bank, and 2 written-explanation questions
Three things make this polygons worksheet effective. First, the non-examples do the teaching: a circle, an open figure, and a shape with crossing sides each break exactly one rule, so students learn the definition by seeing how it fails. Second, the word bank includes a distractor, so children have to count sides instead of matching up leftover words. Third, the written prompts ask for reasoning, which is exactly what state assessments score.
Teachers and parents can extend the lesson away from the page. Go on a polygon hunt around the classroom or the neighborhood and record every shape found on a road sign, a window, a floor tile, or a garden bed. Build shapes with craft sticks or straws and ask students to prove each one is closed. Have children sort pattern blocks by number of sides, then challenge a partner to name each pile.
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