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Classifying Polygons

Learn to classify triangles by angles and sides, and regular polygons. Understand perimeter and interior angles of polygons. Practice drawing triangles and calculating angles. Homework review and practice included.

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Classifying Polygons

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  1. Classifying Polygons Section 9.3

  2. Learning Targets • I can classify triangles. • I can classify quadrilaterals.

  3. Homework Review

  4. Homework Review

  5. Homework Review

  6. Polygon A polygon is a closed plane figure with at least three sides. The sides meet only at their endpoints. • A triangle is a polygon with three sides. You can classify triangles by angle measures. • You can also classify triangles by side lengths. Tick marks are used to indicate congruent sides of a figure.

  7. Classify Triangles

  8. Practice • On your graphic organizer: • Draw an obtuse scalene triangle • Draw an Isosceles Right Triangle.

  9. Quadrilaterals

  10. Regular Polygons • A regular polygon has all sides congruent and all angles congruent. Some regular polygons are shown below.

  11. Perimeter • How would you find the perimeter of a regular triangle? • How would you find the perimeter of a regular hexagon?

  12. Sum of the interior angles • A triangle has a total of _________̊ . • To find the sum of the measure of the interior angles use the following equation. • (n-2)180

  13. Practice • What would the sum of the measures of the interior angles of a hexagon be? • What would the sum of the measures of the interior angles of a dodecagon be?

  14. Homework • Reteaching and Practice 9.3

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