--- /dev/null
+#ifndef MSP_GEOMETRY_CIRCLE_H_
+#define MSP_GEOMETRY_CIRCLE_H_
+
+#include "hypersphere.h"
+
+namespace Msp {
+namespace Geometry {
+
+template<typename T>
+class Circle: public HyperSphere<T, 2>
+{
+public:
+ Circle() { }
+ explicit Circle(T r): HyperSphere<T, 2>(r) { }
+};
+
+} // namespace Geometry
+} // namespace Msp
+
+#endif