The flag of Tanzania consists of a yellow-edged black diagonal band, dividing the field into two triangles: green on the top-left and blue on the bottom-right. The aspect ratio is 2:3.

Colors with their respective HEX codes:

1. Green: #1EB53A
2. Yellow: #FCC81D
3. Black: #000000
4. Blue: #007DB5

Geometric properties:

1. The width of the yellow-edged black diagonal band is 1/6th of the flag's height.
2. The yellow border around the black diagonal band is 1/24th of the flag's height.

Exact measurements depend on the size of the flag being produced, but the proportions remain consistent.