Home Practice
For learners and parents For teachers and schools
Past papers Textbooks
Mathematics
Mathematics Grade 7 Mathematics Grade 8 Mathematics Grade 9 Mathematics Grade 10 Mathematics Grade 11 Mathematics Grade 12
Mathematical Literacy
Mathematical Literacy Grade 10
Physical Sciences
Physical Sciences Grade 10 Physical Sciences Grade 11 Physical Sciences Grade 12
Natural Sciences
Natural Sciences Grade 4 Natural Sciences Grade 5 Natural Sciences Grade 6 Natural Sciences Grade 7 Natural Sciences Grade 8 Natural Sciences Grade 9
Life Sciences
Life Sciences Grade 10
CAT
CAT Grade 10 CAT Grade 11 CAT Grade 12
IT
IT Grade 10 IT Grade 11 IT Grade 12
Full catalogue
Leaderboards
Learners Leaderboard Grades Leaderboard Schools Leaderboard
Campaigns
Headstart #MillionMaths
Learner opportunities Pricing Support
Help centre Contact us
Log in

We think you are located in South Africa. Is this correct?

Introduction

Test yourself now

High marks in science are the key to your success and future plans. Test yourself and learn more on Siyavula Practice.

Sign up and test yourself

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!