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diff --git a/src/geometry/constants.h b/src/geometry/constants.h
new file mode 100644
index 0000000..a33ea2a
--- /dev/null
+++ b/src/geometry/constants.h
@@ -0,0 +1,21 @@
+/*
+ * 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_ */