S1
Reflection Symmetry
反射对称
Symmetry / 对称Grades G3 - G6
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What It Looks Like
Recognition signals — when you see these, think of this structure:
- 1Questions about lines of symmetry or mirror images
- 2Figures that look balanced
- 3Problems asking about reflections or flips
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What It Really Tests
The core mathematical idea behind this structure:
A figure has reflection symmetry if it looks the same when flipped across a line.
如果图形沿一条线翻转后看起来相同，则具有反射对称性。
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Why Students Get Stuck
Common mistakes to watch out for:
- ⚠Counting rotational symmetry as reflection
- ⚠Missing diagonal lines of symmetry
- ⚠Confusing symmetry with similarity
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Your First Step
How to begin thinking about problems with this structure:
Find the line(s) of symmetry: where can you fold the figure so both halves match?
找到对称线：在哪里折叠图形使两半匹配？
Related Structures
These structures share similar patterns or thinking approaches: