What a construction is: tools and rules
- The circle you can trust — 3 tasks
- Two strangers, one point — 3 tasks
- What the compass gives you — 3 tasks
- Reading a page of marks — 3 tasks
- Free choices and tool lists — 6 tasks
- Practice — 27 tasks
- Summary — 2 tasks
- The carried length and the ruler — 3 tasks
Classroom activities
Things a class does rather than writes on. Each one is a finished PDF: print it, cut it up if it says so, and hand it round.
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Construction or Accurate Drawing? — Cut & Glue Sort 25 minutes, including the cutting · 5 sheets
12 small finished pages of compass-and-straightedge marks, each with one sentence, sorted into proved by the marks, shown false by the marks, and no mark says either way — where a picture drawn exactly right still proves nothing without its circle or line.
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Which Move Made This Mark? — Answer Maze 10–15 minutes · 4 sheets
One page and nothing to prepare: 8 small finished pages of compass-and-straightedge marks, and at every box one question — which of the six permitted moves made this mark, or none — with the answer the mark's look gives leading to a box that sends you back.
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What a Construction Is: Could the Six Moves Make This? — Mystery Picture 25–35 minutes · 4 sheets
25 tiny finished pages of compass-and-straightedge marks and no numbers: fill the square if every mark could have been made by the six permitted moves, leave it white if one could not — a line through one dot, a circle with no marked center, an opening that came from nowhere.