Classifying Polygons

Math names shapes by their sides and angles — count the sides, check the angles, and a plain shape earns an exact name.

🔍Is It a Polygon?

✅YES — a Polygon

Closed shape, made of straight line segments that meet end-to-end.

🚫NO — Not a Polygon

A curve, an open shape, or any bendy side breaks the rule.

🔢Name It by Its Sides

Triangle

3 sides

Quadrilateral

4 sides

Pentagon

5 sides

Hexagon

6 sides

Octagon

8 sides

🌳The Quadrilateral Family

both pairs parallel 4 right angles 4 equal sides square = both at once

🔑Key Terms

⬠Polygon A closed 2D shape made of straight line segments.

⬛Quadrilateral A polygon with exactly 4 sides.

▱Parallelogram A quadrilateral with both pairs of opposite sides parallel.

🪁Rhombus A parallelogram with all 4 sides equal in length.

📐Trapezoid A quadrilateral with exactly ONE pair of parallel sides.

✨Regular Polygon A polygon where all sides AND all angles are equal.

⭐ Remember: a square is the all-star — it's a polygon, a quadrilateral, a rectangle, AND a rhombus all at once!

✏️ Math Anchor Chart · Classifying Polygons