Maths Dictionary · JSS 1
Pi (π)
Simple meaning
The number you get when you divide any circle's circumference by its diameter. It is about 3.142 or 227.
Example
Area of a circle = πr2.
See it
From the Perimeter of Plane Shapes lesson. Try moving things around.
P = 2 × (5 + 3) = 16 cm
Walk round the edge: 16 one-centimetre steps. (Area would be 15 cm².) Drag the blue corner.
Length5 cm
Height3 cm