[b][i][size=85]homage a I.M. Gelfand[br][/size][/i][/b][br]Read the problem in the right hand panel.[br][br]You can move the horse down the road by dragging the BLACK dot. [br][br]You can see the region the horse can reach from this point on the road by clicking on the check box.[br][br]The Field point will be RED if that point can’t be reached within the hour from the position on the road.[br][br]The Field point will be BLACK if that point can be reached within the hour from the position on the road.[br][br]What is the shape of the region that the horse can reach within one hour after leaving the barn?[br][br]Can you calculate the area of this region?