[b]Steps:[/b][br]1. On a wax paper draw a line. [br]2. Take a point A outside the line. [br]3. Fold the paper so that the point А is on the line. [br]4. Repeat the step 3 for various positions of A on the line. [br]5. Which shape can you see?[br][br][b]Geogebra construction:[/b] [br]Folding a paper so that point A is on the line means drawing the perpendicular bisector of point A and and a point on the line. [br][br]See the construction below. [br][br]What is the focus?[br]What can you see if point A is near (far from) the line? [br]What can you see if point A is on the line?