Perhaps you are thinking of the flag of Panama, which has a white square in the upper left-hand corner with a blue star in the middle, a red square in the upper right-hand corner, a blue square in the lower left-hand corner, and a white square with a red star in the middle in the lower right-hand corner.
Accorfing to usflsg.org the proportions of the US flag are width) of flag 1.0 length of flag 1.9 or, as a ratio, 10:19. This allows the flag to be made in any size from lapel pin to football field covering and still be "correct"Flag developers are very picky abut all aspects of the flag, the stars, stripes and blue field have their own aspect ratios. Even the colours are not just red, white and blue but:Old Glory Blue Pantone: 282C,Old Glory Red Pantone: 193C,White
The U.S. flag has three shapes on it: the blue rectanglethat has the stars on it and the 13 long rectangular stripes that are red and white.
Flag cases, or often referred to as memorial cases are usually used by veterans to store their medals. They come in a shape of a blue triangle with white stars in it.
600mm is 0.6m, and 450mm is 0.45m, so one flag is 0.27 sq metre. Therefore 4 flags to the square metre
The flag of Taiwan does not share a geometric characteristic.
Romania
The knights of white Kamelia flag has 5 red squares and 4 white squares
A centered white cross blue red squares at the top and red blue squares at the bottom. The center has a small coat of arms with bay laurel and palm fronds
White, Blue & Red. The English flag is red and white. The Welsh flag is red and white. The Scottish flag is blue and white
The flag looks just like the United States of America flag, only it has 6 red stripes, 5 white stripes, and only one white star in the blue square.
The Christian flag is predominantly white, with a smaller dark blue square inside the top left hand corner. This blue square contains a dark red cross inside it.
From top to bottom, the Russian flag has horizontal stripes of white, blue and red.
A square blue flag
This is the Norwegian Flag: red in all corner (two rectangles, two squares) blue stripe (cross), white bordering
The South Korean flag is black, white, blue and red. The North Korean flag is red, blue and white. The flag of the Korean Empire was white, blue and orangey red.
The bavarian flag is white and blue
Red and White. A red rectangle - twice as wide as it is high - with a white square in the middle. There is a red maple leaf on the white square.