def write_a_prst_geom(shape = {})
      attributes = []
      attributes << ['prst', shape.type] if shape.type

      @writer.tag_elements('a:prstGeom', attributes) do
        # Write the a:avLst element.
        write_a_av_lst(shape)
      end
    end
def write_a_prst_geom(shape = {})
      attributes = []
      attributes << ['prst', shape.type] if shape.type

      @writer.tag_elements('a:prstGeom', attributes) do
        # Write the a:avLst element.
        write_a_av_lst(shape)
      end
    end
Write the <a:prstGeom> element.