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圓周 (圖形C)
Author:
Keith Ko
移動右圖中的紅線到左方虛線，就知道它是相等於左圖的哪條線。
GeoGebra
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幾何作圖題：切三圓（題目）
美國國旗 (Codex 版)
世界平面地圖 (Codex╱2026.10.07)
sanjiaohanshu
找出對稱軸
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P2 math
堆疊(圓、正方形、正三角形)
平行四邊形
cycloid
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Fractions
Sphere
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Surface