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Classifying Polygons

Classifying Polygons. What is a polygon?. Definition: Closed plane figure with at least three sides Sides only meet at their endpoints (called vertices) Regular polygons have all sides and angles congruent. Classifying Polygons. What is the rule for regular polygons?.

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Classifying Polygons

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  1. Classifying Polygons

  2. What is a polygon? • Definition: Closed plane figure with at least three sides • Sides only meet at their endpoints (called vertices) • Regular polygons have all sides and angles congruent

  3. Classifying Polygons

  4. What is the rule for regular polygons? Any polygon with sides n: Sum of interior angles formula:(n-2) × 180° Each angle formula: (n-2) × 180° / n

  5. How are triangles classified? • Acute- three acute angles (less than 90°) • Right- one right angle • Obtuse- one obtuse angle (more than 90°) • Equilateral- three congruent sides • Isosceles- two congruent sides • Scalene- no congruent sides

  6. How are quadrilaterals classified? • Trapezoid- one pair of parallel sides • Parallelogram- both pairs of opposite sides are parallel • Rhombus- four congruent sides • Rectangle- four right angles • Square- four right angles and four congruent sides

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