3x4

3x4 is a notation used to describe a dimension consisting of three units by four units. It is commonly read as “three by four” and is used across mathematics, science, and everyday measurement. The product 3×4 equals 12, which is the total count of unit elements in a 3×4 arrangement.

Geometrically, a 3-by-4 rectangle has width 3 and height 4 (or the reverse). Its area is 12 square units, and its perimeter is 14 units. The aspect ratio is 3:4, which is equivalent to 0.75.

In linear algebra, a 3×4 matrix has three rows and four columns, containing 12 entries. It represents a linear transformation from R4 to R3 or a collection of data arranged in three rows.

In photography and printing, 3×4 inch prints are a common small size for identification photos and compact prints in some contexts.