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**What is Metric Paper?**

Metric paper or “A” size paper has almost magical
properties. It is has the amazing unique as it is the **only** rectangle
which when folded in half creates a **similar** rectangle.

To find out why this is click here

If we start with a sheet of A4 paper we can create a
family of similar rectangles from “A” size paper by folding and cutting in
half. Each new rectangle is also an “A”
rectangle; first comes A5, then A6, then A7 and so on.

If we put two A4 sheets together we create an A3 rectangle. 4 sheets
give us A2, 8 sheets A2 and16 sheets of A4 make an A1 rectangle. And an A0
rectangle has an area of 1 square metre!