The flag of Armenia is a horizontal tricolor with three equal bands. The color codes for these bands are:

1. Red: #D90012
2. Blue: #0033A0
3. Orange: #F2A800

The aspect ratio of the flag is 1:2, meaning its width is twice its height. Geometrically, the flag can be described as a rectangle divided into three equally sized horizontal stripes.

The specific measurements of the flag may vary depending on the situation it's used in or the size required, but the proportion remains consistent at 1:2.