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E V E R Y D A Y

E V E R Y D A Y. 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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E V E R Y D A Y

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  1. EVERYDAY

  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. The sum of the angles of a polygon with n sides, where n is 3 or more, is 180° × (n - 2) degrees.

  7. Are these regular polygons? Why or why not? A: No… These sides are all the different lengths, and the angles are all different.

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

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

  10. Triangle A three-sided polygon. The sum of the angles of a triangle is 180 degrees.

  11. Equilateral Triangle A triangle having all three sides of equal length. The angles of an equilateral triangle all measure 60 degrees.

  12. Isosceles Triangle A triangle having two sides of equal length.

  13. Scalene Triangle A triangle having three sides of different lengths.

  14. Acute Triangle A triangle having three acute angles.

  15. Obtuse Triangle A triangle having an obtuse angle. One of the angles of the triangle measures more than 90 degrees.

  16. Right Triangle A triangle having a right angle. One of the angles of the triangle measures 90 degrees.

  17. Quadrilateral A four-sided polygon. The sum of the angles of a quadrilateral is 360 degrees.

  18. Rectangle A four-sided polygon having all right angles. The sum of the angles of a rectangle is 360 degrees.

  19. Square A four-sided polygon having equal-length sides meeting at right angles. The sum of the angles of a square is 360 degrees.

  20. Parallelogram A four-sided polygon with two pairs of parallel sides. The sum of the angles of a parallelogram is 360 degrees.

  21. Rhombus A four-sided polygon having all four sides of equal length. The sum of the angles of a rhombus is 360 degrees.

  22. Trapezoid A four-sided polygon having exactly one pair of parallel sides. The two sides that are parallel are called the bases of the trapezoid. The sum of the angles of a trapezoid is 360 degrees.

  23. Pentagon A five-sided polygon. The sum of the angles of a pentagon is 540 degrees.

  24. Hexagon A six-sided polygon. The sum of the angles of a hexagon is 720 degrees.

  25. Heptagon A seven-sided polygon. The sum of the angles of a heptagon is 900 degrees.

  26. Octagon An eight-sided polygon. The sum of the angles of an octagon is 1080 degrees.

  27. Nonagon A nine-sided polygon. The sum of the angles of a nonagon is 1260 degrees.

  28. Decagon A ten-sided polygon. The sum of the angles of a decagon is 1440 degrees.

  29. Circle A circle is the collection of points in a plane that are all the same distance from a fixed point. The fixed point is called the center. A line segment joining the center to any point on the circle is called a radius.

  30. Convex A figure is convex if every line segment drawn between any two points inside the figure lies entirely inside the figure. A figure that is not convex is called a concave figure.

  31. Credits • Math League – Steve Conrad http://www.mathleague.com/help/geometry/polygons.htm

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