(i) An equilateral triangle has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(ii) An isosceles triangle has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(iii) A scalene triangle has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(iv) A rectangle has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(v) A rhombus has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(vi) A square has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(vii) A parallelogram has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(viii) A quadrilateral has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(ix) A regular pentagon has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(x) A regular hexagon has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.

(xi) A circle has an  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry all along the diameters.

(xii) A semicircle has  1 line2 lines3 lines4 lines5 lines6 linesinfinite number of linesno lineonly one line of symmetry.