球體
球體kau4 tai2（英文：sphere），若果三維或更高維空間裏面固定一點，每點距離個固定點都相等嘅嘢，人稱球或球面。
呢個幾何形狀描述嘅其實就係一個波形，所以叫做「球」。
公式
- 表面面積
- 體積
- 球方程
推廣
維度
球面可以推廣去任意維度。對任何自然數 n，一個 n-球面（通常寫做
睇埋
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