Initial commit

Experiment/graph/Exp3/Circle.mermaid

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+flowchart TD
+    Start([开始]) --> A[创建Circle对象c，半径为5]
+    A --> B1[Circle构造函数执行]
+    B1 --> B2[设置radius=5]
+    B2 --> B3[计算周长$$perimeter=2\times π\times radius$$]
+    B3 --> B4[计算面积$$area=π\times radius\times radius$$]
+    B4 --> C["调用c.getRadius()打印半径"]
+    C --> D["调用c.getPerimeter()打印周长"]
+    D --> E["调用c.getArea()打印面积"]
+    E --> End([结束])