EMS - Reference question N°046 Circles[br]Points B, C, D, are on a same straight line f ; A is a point out of straight line[br]f.[br]Points E, F and G are the centres of circles of respective diameters [AB],[br][AC] and [AD].[br]Prove the points E, F, G are on a same straight line g.[br]Moreover, prove that lines f and g are parallel