mathematic symmetry

2d algebra ancient angle art artwork axis basic color coloring colors concept conic conical curvature design directrix divided draw drawing education educational engraved engraving equation equidistant etching focus gemetric geometrical geometry height homework idea illustration intersection isosceles kid kids kindergarten length line loci locus math mathematic mathematics owl page parabola parabolae parallel perpendicular physics picture planar plane planemetry point preschool proportion proportional school section shape side simple surface symmetric symmetry task teacher teaching technical template triangle triangular vector vectors vertex