The flag of Sudan has a horizontal tricolor design with stripes of red, white, and black from top to bottom, and a green triangle on the hoist side. The aspect ratio is 1:2.

Colors:

• Red: Pantone 186 C, HEX #CE1126, RGB (206,17,38)
• White: Pantone Safe, HEX #FFFFFF, RGB (255,255,255)
• Black: Pantone Black C, HEX #000000, RGB (0,0,0)
• Green: Pantone 355 C, HEX #007A3D, RGB (0,122,61)

Geometric properties:

• The red, white, and black stripes are equal in width, each occupying one-third of the flag's height.
• The green triangle on the hoist side extends to half of the flag's length and is an isosceles triangle with the two equal sides being the height of the flag.

Measurements will depend on the specific size of the flag you're looking for, but the main aspect ratio (1:2) and proportions of the elements remain consistent.