The folowing table expresses '90' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
Base | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
---|---|---|---|---|---|---|---|
2 | 1011010 | 100 | 1 | ||||
3 | 10100 | 2 | |||||
4 | 1122 | 12 | 3 | ||||
5 | 330 | 11 | 2 | ||||
6 | 230 | 5 | |||||
7 | 156 | 15 | 6 | ||||
8 | 132 | 6 | |||||
9 | 110 | 2 | |||||
10 | 90 | 9 | |||||
11 | 82 | A | |||||
12 | 76,11 | 2 | |||||
13 | 6C,15 | 6 | |||||
14 | 66 | C | |||||
15 | 60 | 6 | |||||
16 | 5A | F |
Factors: 2 * 32 * 5
90 is the interior angle of a 'Square (or Tetragon)' (see 'regular polygons').
A 'Enneacontagon' is a 'regular polygon' with 90 sides.
90 is the atomic weight of Thorium (Th).