For an equilateral triangle, there are three axes of symmetry. A plane figure is symmetrical about the line l if, whenever P is a point of the figure, so too is P', where P' is the mirror-image of P...
One, straigh down the center * * * * *No, there are three. Each of the three medians is a line of symmetry. These also correspond to altitudes or perpendicular bisector of sides for equilateral...