👉 In mathematics, the term "unmensurable" refers to a quantity that cannot be expressed or represented as a ratio of two whole numbers. In other words, it is an irrational number. Examples of unmeasurable quantities include: - The square root of 2 (which is approximately 1.414), but not exactly equal to 1. - π (pi) which is an irrational number that cannot be expressed as a finite decimal or rational number with more than one digit