亂數選擇圓心、長短半徑，原則上不會出現 半徑相同的圓，
預設讓 b < a ，所以橢圓都是【扁】的。
- Resource Type
-
Activity
- Tags
-
橢圓
- Target Group (Age)
- 15 – 19+
- Language
- Chinese Traditional / 繁體中文
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