What is the calculator key for entering pi (π)?

The calculator key for entering pi (π) is usually labelled as "π" or "PI" and is often found by pressing the "shift" or "2nd" key first.

On most scientific calculators, the pi (π) key is a shortcut to input the value of π, which is approximately 3.14159. This key is typically located above another key, meaning you will need to press the "shift" or "2nd" key to access it. For example, on many Casio calculators, you might find the π symbol above the "EXP" key, so you would press "shift" followed by "EXP" to enter π.

Using the π key is crucial for accuracy in calculations involving circles, such as finding the circumference or area. Instead of typing 3.14, which is a rounded approximation, using the π key ensures you use the most precise value your calculator can handle. This is especially important in exams where precision can make a difference in your final answer.

If you are using a graphing calculator or a calculator app on your phone, the π key might be directly visible on the main keypad or under a specific function menu. Always check your calculator's manual if you are unsure where to find it. Familiarising yourself with this key will save you time and improve the accuracy of your work in GCSE Maths.