What context can I use each word in?
Learn when and how to use these words with these examples!
equilateral
Example
An equilateral triangle has three equal sides. [equilateral: adjective]
Example
The equilateral polygon has six congruent sides. [equilateral: noun]
regular
Example
A regular hexagon has six equal sides and angles. [regular: adjective]
Example
The regular polygon has eight congruent sides. [regular: noun]
Good things to know
Which word is more common?
Regular is more commonly used than equilateral in everyday language, as it can describe a wider variety of shapes. Equilateral is a more technical term that is primarily used to describe triangles.
What’s the difference in the tone of formality between equilateral and regular?
Equilateral is a more formal term than regular, which is more versatile and can be used in both formal and informal contexts.
