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2-D Figures

2-D Figures. Mrs. Carter 4 th grade. Polygon. A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others. Q: Is this a polygon? Why or why not?. A: No… Polygons are closed figures. Q: Is this a polygon? Why or why not?. A: No…

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2-D Figures

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  1. 2-D Figures Mrs. Carter 4th grade

  2. Polygon A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others.

  3. Q: Is this a polygon? Why or why not? A: No… Polygons are closed figures.

  4. Q: Is this a polygon? Why or why not? A: No… It is not made of line segments.

  5. Q: Is this a polygon? Why or why not? A: No… Its sides do not intersect in exactly two places each.

  6. Regular Polygons A regular polygon is a polygon whose sides are all the same length, and whose angles are all the same.

  7. Vertex • The vertex of an angle is the point where the two rays that form the angle intersect.

  8. Vertex of a Polygon • The vertices of a polygon are the points where its sides intersect.

  9. Triangle A three-sided polygon.

  10. Quadrilateral A four-sided polygon.

  11. Pentagon A five-sided polygon.

  12. Hexagon A six-sided polygon.

  13. Heptagon A seven-sided polygon.

  14. Octagon An eight-sided polygon.

  15. Nonagon A nine-sided polygon.

  16. Decagon A ten-sided polygon.

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