Rule hunter field report

The sheet asks for three rules found outdoors — natural or man-made, it does not care — and for each one, where it was found, what the rule is, and why it might exist. Then: what do the three have in common.

The middle task is the one that makes this sheet worth printing. Find something that looks like a right angle — a fence corner, a wall, a doorframe — and prove it. Measure the two short sides and the long one, square them, add, compare. The sheet has boxes for a squared, b squared, their sum, and c squared, so the arithmetic has somewhere to live.

Then three checkboxes: yes, nearly, or no. And if it is only nearly, a line asking why the error is there. That line is the point. Real corners are not perfectly square, tape measures slip, and a child who writes down why their measurement missed is doing what a scientist does.

The last task is a formal-register explanation of one rule found that day: why it exists, and what would happen without it.