當學生嘗試過把五組三角形拼成平行四邊形後，會有一附加部分出現。
學生能在附加部分中自行製作出三角形，再拼出平行四邊形。
Yanki
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- Resource Type
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- Tags
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- Target Group (Age)
- 10 – 12
- Language
- Chinese Traditional / 繁體中文
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