圆盘
Also known as disc, filled circle, circular area
平面上以圓為界的區域
AI overview
A disk is a flat, round shape that includes everything inside a circle, including the circle's edge itself. It matters in mathematics and everyday life because many objects—from plates to wheels to coins—are disk-shaped, making it a fundamental form for understanding geometry and designing practical things.
AI-generated from the Wikipedia summary — may contain errors.
Article · 中文
在几何中，一个圆盘（disk 或 disc）是由平面中一个圆（circle）围成的区域。一個圓只包含邊界，而一個圓盤包含内部區域。在度量幾何與凸分析中，圓盤是凸集，因為每兩點之間的直线點都落在該點集合中；但是圓不是凸集，因為它是中空的。
Abstract from DBpedia / Wikipedia · CC BY-SA