Which of the following is an irrational number?

An example of an irrational number is the square root of 2 (√2), which is approximately 1.41421356 and continues infinitely without repeating. This number cannot be expressed as a simple fraction of two integers, making it irrational. It's famously known as the length of the diagonal of a square whose sides are each one unit long! Another well-known irrational number is π (pi), which represents the ratio of a circle's circumference to its diameter. Its decimal expansion starts with 3.14159 and goes on forever without repeating. Not only is π essential in geometry, but it also pops up in various areas of mathematics, physics, and engineering, making it super useful in the real world!