--- /dev/null
+/*
+ * constants.h
+ *
+ * Created on: Apr 26, 2012
+ * Author: holy
+ */
+
+#ifndef GEOMETRY_CONSTANTS_H_
+#define GEOMETRY_CONSTANTS_H_
+
+#include <cmath>
+
+
+namespace geometry {
+
+const double PI(std::atan(1.0) * 4.0);
+
+}
+
+
+#endif /* GEOMETRY_CONSTANTS_H_ */