6th grader

1. Geometry For Dummies Lines Angles Triangle Quadrilateral Circles Other Polygons

14. Angles Right Angles Obtuse Angles Acute Angles

15. Right Angles An angle that is 90 degrees.

16. Obtuse Angles An angle that is more that 90 degrees. 180

17. Acute Angles An angle that is less than 90 degrees. 80 degrees

18. Triangles Equilateral Triangle Isosceles Triangle Scalene Triangle Acute Triangle Obtuse Triangle Right Triangle

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

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

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

22. Acute Triangle A triangle having three acute angles.

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

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

25. Quadrilaterals Square Rhombus Trapezoid Parallelogram Rectangle

28. Rectangle A rectangle is a square but stretched out two sides are equal and the other are equal but a different size.

31. Circles Chords Diameter Arc Radius Sector Circumference Area of a Circle

32. Chords Segment connecting two outside points on a circle. E J EJ

33. Diameter Longest chord on a circle; passes through the center of the circle. T E TE

34. Arc The portion of the circle E J

35. Radius Half of the length of the diameter; runs from the center of the circle to its edge. J E

36. Sector A slice of a circle's area, defined by two points on the outside boundaries. The vertex of the slice is the center of the circle. E F

37. Circumference The distance around the outside of a circle; its perimeter. 3.14

38. Area of a Circle The amount inside the circle. Pie r 2

39. Other Polygons Pentagon Hexagon Heptagon Octagon Nonagon Octagon

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

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

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

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

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

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

46. The Credits Directed by: Emma Jia Designed by: Emma Jia Pictures from: http://www.flickr.com http://www.mathleague.com From: Room 15, Mr. Lindsay's class