I. Definitions of Geometric Magnitudes.
66. Right angle defined .
13
34. Geometry defined
8 67. A perpendicular defined
13
35. A solid defined
8 68. Complement defined
13
36. A surface defined
8 69. Acute angle defined.
13
37. A line defined.
8 70. Obtuse angle defined
13
38. A point defined
8
71. Perigon defined
13
39. A magnitude defined
8 72. Sum of angles about a point is a
40-43. Point, line, surface, solid, de-
perigon
14
fined, using motion.
8 73. Reflex angle defined
14
44. Why space is called tri-dimensional, 9 74. Oblique angles and lines defined
14
45. Straight line defined
9 75. Vertical angles defined.
14
46. A curve defined
9 76. Bisector defined
14
47. Line henceforth means straight 77. A trace defined
14
line
9 78. A triangle defined
15
48. A sect defined.
9 79. Vertices defined
15
49. A plane defined
9
80. Sides defined
15
50. Plane defined, using motion
9 81. Interior angle defined
15
51. A figure defined .
9 82. Exterior angle defined .
15
52. A plane figure defined
9 83. Congruent defined
15
53. Circle and center defined
84. Equivalent defined
15
54. Radius defined
55. Diameter defined.
II. Properties of Distinct Things.
56. Arc defined .
85-93. The so-called axioms of arith-
57. Parallel lines defined
metic,
58. Angle, vertex, arms, defined .
59. Explement defined
III. Some Geometrical Assumptions about
60. Equal angles defined
Euclid's Space.
61. Adjacent angles and their sum de-
fined
94-99. The so-called geometric axioms, 16
62. Straight angle defined .
IV. The Assumed Constructions.
63. When two adjacent angles equal a
straight angle .
12 100-103. The so-called postulates.
17
64. Supplement defined.
65. Supplemental adjacent angles 12 | Table of symbols used
PRIMARY RELATIONS OF LINES, ANGLES, AND TRIANGLES.