# Chapter 16: Area and perimeter of 2D shapes

## 16.1 Introduction

Pi (\(\pi\)) is an irrational number. Expressed as a decimal number, it has an infinite number of decimals and no repeating pattern. Can you guess how many digits have been calculated for the value of \(\pi\)? In \(2021\), a supercomputer calculated \(\pi\) to \(\text{62,8}\) trillion decimal places!