The flag of Sri Lanka consists of a yellow-bordered maroon field with a large golden lion holding a kastane (a traditional sword) in its right forepaw, positioned in the center. On the left side, there are two vertical stripes: green and orange.

Colors:

1. Maroon (field): Pantone 1955 C
2. Green (stripe): Pantone 355 C
3. Orange (stripe): Pantone 165 C
4. Yellow (border and lion): Pantone 116 C

Aspect ratio: 1:2

Geometric properties and measurements:

1. The total width of the flag is divided into 16 parts.
2. The maroon field occupies 12 parts out of the 16 parts of the entire width.
3. The yellow border surrounding the maroon field is 1/16th of the flag's width.
4. The green stripe (on the left) is 2 parts out of the 16 parts of the flag's width.
5. The orange stripe (adjacent to the green stripe) is 1 part out of the 16 parts of the flag's width.
6. The height of the lion is 8/9ths of the maroon field height, centered in the field.

The flag does not have any specific measurements, but the proportions must be maintained as per the given aspect ratio and geometric properties.