Wait — perhaps use π=22/7? No, specified 3.14.

Sun, 03 May 2026 08:31:52 +0000

Understanding Pi (π): Why We Often Use 22/7 Despite Its Approximation When diving into math, one constant stands out above the rest: π (pi). Defined as the ratio of a circle’s circumference to its diameter, π remains one of the most fascinating and essential mathematical constants. But while π is technically an irrational number with an infinite, non-repeating decimal expansion (approximately 3.1415926535…), many still reference the simplified fraction 22/7 as a close approximation. ### Why Use 22/7? A Historical and Practical Explanation Despite knowing that π ≈ 3.141592…, the fraction 22⁄7 ≈ 3.142857…—a value that’s only about 0.001% higher than the real π. Yet, this rough approximation has endured through centuries of use. So why do people still cite 22⁄7 instead of the exact decimal or higher precision values?