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Family 9
Rotation & reflection (paper-only)
These 1 topics share one solution. Spot the family, apply the method — same trick, different story.
How to spot this family
- Rotation & reflection matrices："rotation through angle θ" · "reflection in the line ..." · 求 2×2 变换矩阵并作用到点上
Topics in this family
Related knowledge points
The concepts behind this family's method — brush up first if unsure.