Quadrilateral - a polygon with 4 sides and 4 vertices., right angle - Where two sides meet and form 90 degrees., Polygon - a closed shape with straight lines. , Triangle - 3 sides, Pentagon - 5 sides , Hexagon - 6 sides , Heptagon - 7 sides , Octogon - 8 sides , Nonagon - 9 sides , Decagon - 10 sides, Hendecagon - 11 sides, Dodecagon - 12 sides,

Polygon Vocabulary Words

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