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Draw a round shape by eye. Lay a ruler across it two ways. You get two different numbers. It looks round. It is not.

Figure 1 — two moves: check a figure with numbers, and carry a length with a compass.

What this track covers

Exact, not neat — check with numbers, not with your eyes.
The circle — every point is the same distance from the centre.
Across the middle — that line is two radii long.
Carrying a length — a compass copies a length. No number needed.
Square corners — test one without a protractor, the tool that measures angles.
Order — some steps must wait for others.

This is Chapter 8 of your Class 6 book, Playing with Constructions. Keep a ruler and a compass ready.