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Classifying Polygons

Classifying Polygons. Section 9.3. Learning Targets. I can classify triangles. I can classify quadrilaterals. Homework Review. Homework Review. Homework Review. Polygon. A polygon is a closed plane figure with at least three sides . The sides meet only at their endpoints.

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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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