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Lesson 61: Perimeter of a Polygon

Lesson 61: Perimeter of a Polygon. Ms. Jamie Scordino 3 rd Grade Math. Review Rules of Polygons. A polygon is a plane shape with straight sides. 1) 2-dimensional (2D) 2) Made of straight lines 3) Closed (all lines connect). Key Vocabulary.

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Lesson 61: Perimeter of a Polygon

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  1. Lesson 61: Perimeter of a Polygon Ms. Jamie Scordino 3rd Grade Math

  2. Review Rules of Polygons A polygon is a plane shape with straight sides. 1) 2-dimensional (2D) 2) Made of straight lines 3) Closed (all lines connect)

  3. Key Vocabulary The perimeter of a polygon is the distance around the outside of the polygon.

  4. Perimeter Perimeter - add all sides. 7mm 3mm 7mm + 3mm 20 mm

  5. Perimeter Perimeter - add all sides. 5 units 4 units 2 units 7 units + 1 unit 19 units

  6. Perimeter Perimeter - add all outside sides. Remember it is the distance AROUND the outside! 3 units 4 units 3 units 3 units 6 units + 10 units 29 units

  7. Perimeter Perimeter - add all sides. Sometimes you need to figure out a side 6 cm 3 cm 6 cm + 3 cm 18 cm 3 cm 6 cm

  8. Perimeter Practice Click on the following link to practice finding the perimeter of polygons. http://www.funbrain.com/cgi-bin/poly.cgi?A1=s&A2=2&A15=1&INSTRUCTS=1

  9. Your Turn Thank you for a great lesson!

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