The Singing Hedgehog Guide
to:

Circles

Circles

π is the Greek letter p or "pi"

In a circle, π is just how many times the distance across a circle will fit round the outside of the circle, which is a little over three

The normal approximations for π are 3.14 or 22/7

We have some formulae to remember:

In a circle, π is just how many times the distance across a circle will fit round the outside of the circle, which is a little over three

The normal approximations for π are 3.14 or 22/7

We have some formulae to remember:

- diameter = twice the radius
- radius = half the diameter

- circumference = pi x diameter

C = πd

- area = pi x radius squared

A = πrē