As an example, we'll write a function that takes two points, the center of the circle and a point on the perimeter, and computes the area of the circle.
下面我们写一个函数作为例子，这个函数需要两个点，一个是圆心，一个是圆周上面的点，函数要用来计算这个圆的面积。
The Lüzhou Zhonghuan Center project has characteristics such as large area, multiple buildings, high main building, many circle center and arc with different radius, difficulty setting-out.
绿洲中环中心工程占地面积大、幢数多、主楼高度高，平面由多个不同圆心、不同半径圆弧组成，测量放线难度高。
Sanxingdui Ruins is located in the central area of the Shu culture circle, and it is the representative of this culture as well as the center of the ancient Shu culture.
三星堆遗址位于蜀文化圈的中心区域，是蜀文化的典型代表，也是古蜀文化的中心。
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