Chapter 9 Vocabulary and Formulas, page 1 of 5
DIRECTIONS
1. DEFINITIONS OR FORMULAS
For each vocabulary term or formula, write out the definition of the term or give the formula. If
you are giving a formula, define your variables (e.g., don't write just A = b x h, write Area = Base
x Height or A = b x h, and define A = area, b = base and h = height).
2. SKETCH
A simple sketch (picture) is required for each term unless specified by: NO PICTURE. For terms
that require a sketch; draw a simple and labeled sketch of the item you are defining.
Recommendation: Don't waste time on fancy graphics
Section 9.1
1.
Point
2.
Line
3.
Collinear Points
4.
Plane
5.
Line Segment
6.
Ray
7.
Angle
8.
Right Angle
9.
Acute Angle
Chapter 9 Vocabulary and Formulas, page 2 of 5
10. Obtuse Angle
11. Straight Angle
12. Reflex Angle
13. Supplementary Angles
14. Complimentary Angles
15. Adjacent Angles
16. Vertical Angles
17. Perpendicular Lines
18. Parallel Lines
19. Transversal Line
20. Alternate Interior Angles
21. Simple Curve
Chapter 9 Vocabulary and Formulas, page 3 of 5
22. Simple Closed Curve
23. Closed Curve
24. Concave
25. Convex
26. Circle
27. Radius
28. Diameter
29. Chord
30. Tangent to a Circle
31. Circumference
32. Disc
33. Polygon
34. Vertex
Chapter 9 Vocabulary and Formulas, page 4 of 5
35. Adjacent Sides (polygon)
36. Adjacent Vertices (polygon)
37. Triangle
38. Right Triangle
39. Scalene Triangle
40. Acute Triangle
41. Isosceles Triangle
42. Obtuse Triangle
43. Equilateral Triangle
44. Quadrilateral
45. Trapezoid
46. Isosceles Trapezoid
47. Square
Chapter 9 Vocabulary and Formulas, page 5 of 5
48. Rectangle
49. Rhombus
50. Parallelogram
51. Pentagon
52. Hexagon
53. Heptagon
54. Octagon
55. Nonagon
56. Decagon
57. Dodecagon