chapter2 : polygons 2
Name
|
Sides
|
Interior Angle
|
Exterior Angle
|
Triangle (or Trigon)
|
3
|
60°
|
120°
|
Quadrilateral (or Tetragon)
|
4
|
90°
|
90°
|
5
|
108°
|
72°
| |
6
|
120°
|
60°
| |
Heptagon (or Septagon)
|
7
|
128.571°
|
51.429°
|
Octagon
|
8
|
135°
|
45°
|
Nonagon (or Enneagon)
|
9
|
140°
|
30°
|
Decagon
|
10
|
144°
|
36°
|
chapter3 : circles ll
