资源说明:根据三个点坐标计算出曲率
X_1=black_center[Y_1];
X_2=black_center[Y_2];
X_3=black_center[Y_3];
S=((X_2-X_1)*(Y_3-Y_1)-(X_3-X_1)*(Y_2-Y_1))/2;
AB=(X_2-X_1)*(X_2-X_1)+(Y_2-Y_1)*(Y_2-Y_1);
BC=(X_3-X_2)*(X_3-X_2)+(Y_3-Y_2)*(Y_3-Y_2);
AC=(X_3-X_1)*(X_3-X_1)+(Y_3-Y_1)*(Y_3-Y_1);
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