Rectangular vs. Oblong — What's the Difference?

Rectangular is a term that describes a geometric shape characterized by four straight sides and four right angles. The opposite sides in a rectangle are parallel and of equal length. Oblong, however, is a term that is often used to describe any elongated shape and is most commonly associated with rectangles where the adjacent sides are of unequal lengths.

In mathematics and geometry, Rectangular is a more specific term, with precise requirements for the angles and the lengths of opposite sides. Oblong is a broader term, often used in common language, that encompasses more shapes, including elongated circles or even squares stretched in one dimension. While a square can be considered a specific type of rectangle, it would not be described as oblong because all its sides are equal.

Rectangular shapes are prevalent in various applications, including architecture, design, and everyday objects. Oblong shapes are also frequently seen, especially in items that require an elongated form, such as certain fruits, pills, or decorative items. In this sense, Oblong is more flexible and can describe a wider variety of items and shapes, while Rectangular is constrained to its mathematical definition.

When it comes to categorization, all squares are rectangles, but not all rectangles are squares. Similarly, all Rectangular shapes with unequal adjacent sides can be considered Oblong, but not all Oblong shapes are Rectangular. For example, an elongated oval could be described as oblong but not rectangular.