Page 141 - Revised Maths Wisdom Class - 6

Symmetry 139

Symmetry of 2D Figures

Let us explore the symmetry in 2D shapes and figures. Triangle, circle, square, etc. are all 2D shapes and these
shapes may have one, two, more or no lines of symmetry.

Triangles

Not all shapes have lines of symmetry, or they may have several lines of symmetry. For example, a triangle can
have 3 or 1 or no lines of symmetry:

Equilateral Triangle Isosceles Triangle Scalene Triangle
(all sides equal, (two sides equal, (no sides equal,
all angles equal) two angles equal) no angles equal)
3 Lines of Symmetry 1 Line of Symmetry No Lines of Symmetry

Quadrilaterals
Different types of quadrilaterals (a 4-sided plane shape) have different lines of symmetry.

Square Rectangle Irregular
(all sides equal, (Opposite sides equal, Quadrilateral
all angles 90°) all angles 90°)
4 Lines of Symmetry 2 Lines of Symmetry No Lines of Symmetry

Kite Rhombus
(all sides equal)
1 Line of Symmetry 2 Lines of Symmetry