The flag of Guyana, also known as "The Golden Arrowhead," has an aspect ratio of 3:5. It consists of five colors: green, white, golden yellow, black, and red. The flag features a green field with a red isosceles triangle on the hoist side, bordered by two thin white stripes and a larger golden yellow triangle. A black stripe runs along the top and bottom edges of the golden yellow triangle.

Color codes:

1. Green: Pantone 349 C, HEX #006A44, RGB (0,106,68)
2. White: HEX #FFFFFF, RGB (255,255,255)
3. Golden Yellow: Pantone 123 C, HEX #FCD116, RGB (252,209,22)
4. Black: HEX #000000, RGB (0,0,0)
5. Red: Pantone 186 C, HEX #CE1126, RGB (206,17,38)

Geometric properties:

1. The red triangle's base is parallel to the hoist side and its apex meets the fly side.
2. The golden yellow triangle's base is parallel to the fly side and its apex meets the hoist side.
3. The white stripes bordering the red triangle are fimbriations, separating it from the green field and the golden yellow triangle.
4. The black stripes run along the top and bottom edges of the golden yellow triangle, parallel to the fly side.