Initial commit

Experiment/graph/Exp1/CircleCalc.mermaid

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+flowchart TD
+    A[开始] --> B[定义半径 radius = 3.0]
+    B --> C[计算周长 circumference = 2 * Math.PI * radius]
+    C --> D[计算面积 area = Math.PI * radius * radius]
+    D --> E[输出圆的周长]
+    E --> F[输出圆的面积]
+    F --> G[结束]