Reflections, rotations, translations

Three ways to move a shape without changing its size: slide it, turn it, or flip it. Only the flip reverses left and right, which is why a reflected letter looks wrong and a rotated one often does not.

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LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Practice — 4-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Practice — 5-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

GEO-08Line and rotational symmetry

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GEO-14Tiling and tessellation GEO-15Paper folding and hole punching

In official papers

No indexed official paper question has been tagged with GEO-09 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.

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