Planar Geometry Terms

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A list of geometry terms, illustrations, and definitions by a sixth grader.

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Planar Geometry Terms

  1. 1. Geometry Guide Lines planes points angles
  2. 2. Point A dot with a letter
  3. 3. Lines A line that goes on for ever f s
  4. 4. Line Segment A straight line s m
  5. 5. Ray One line that goes on for ever f d
  6. 6. Plane A flat end that extends s d a
  7. 7. Intersecting Two lines that cross
  8. 8. Perpendicular A right angle 90 degrees
  9. 9. Parallel Two lines that don't cross
  10. 10. Skew Lanes that are not in the same plane
  11. 11. Acute A 50 degree angle
  12. 12. Obtuse A 180 degree angle
  13. 13. Vertex/ Vertice The middle point
  14. 14. Right A 90 degree angle
  15. 15. Straight A straight angle that equals thats 180 degrees
  16. 16. Complementary If the measure is 90 degree 15 75
  17. 17. Supplementary If the measure is 180 degrees 100 80
  18. 18. Vertical/ Opposite Are opposite two lines interesect r m n p q
  19. 19. adjacent Side by side common vertex and ray s t w d f
  20. 20. Triangles Obtuse Acute Right Equilateral Isosceles Scalene
  21. 21. Obtuse Triangle The greatest angle is the obtuse that equals 180
  22. 22. Acute Triangle The greatest angle is an acute angle that equals 180
  23. 23. Right Triangle The greatest angle is a right angle that equals 180
  24. 24. Equilateral triangle 3 congruent sides
  25. 25. Isosceles Triangle At least 2 congruent sides
  26. 26. Scalene Triangle No congruent sides
  27. 27. Perimeter Add all the sides up 5 5 15 5+5+15=25
  28. 28. Sum of Internal Angles The sides and the triangles 4 sides and 2 triangles 2 x 180 = 360
  29. 29. Area Time the base and height 10 20 15
  30. 30. Quadrilaterals Trapezoid Parallelogram Rectangle Rhombus Square
  31. 31. Quadrilateral A box that makes 4 right angles
  32. 32. Trapezoid 2 set of parallel line
  33. 33. Parallelogram 4 connected sides
  34. 34. Rectangle Four right angles
  35. 35. Rhombus Four congruent sides
  36. 36. Square Congruent sides
  37. 37. Area of a Rectangle Times the outside then divided by two 25 10
  38. 38. Area of a Square The outside is times then divided 6 8
  39. 39. Area of a Parallelogram Times and then divided
  40. 40. Area of a Trapezoid The outsides are times then divided 9
  41. 41. Circles Chord diameter sector radius
  42. 42. Chord Where you draw a line at the top
  43. 43. Diameter The middle part of a circle
  44. 44. Arc A part of a circle named by two rays with common endpoints. a b
  45. 45. Radius The outside of the circle radius
  46. 46. Sector A region enclosed by two radii
  47. 47. Circumference The distance around a circle 6m.
  48. 48. Area of circle The outside of a circle
  49. 49. Other Polygons Pentagon hexagon octangon
  50. 50. Pentagon It has 5 sides
  51. 51. Hexagon All sides are congruent
  52. 52. Octogon It has six sides

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