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# 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