![]() ![]() If corresponding to each point ‘P’ on the figure, there exists a point ‘P’ on the other side of centre, which is directly opposite to the point ‘P’ and lies on the figure. Note: The following letters of the English alphabet have one or more line of symmetry:Ī figure is said to be symmetric about a point ‘O’ called the centre of symmetry. In the figure, the rectangle ABCD is symmetrical about the lines PR&QSĪ square has four lines of symmetry- its two diagonals and the line joining the mid-points of its opposite sides.Ī circle has an infinite number of lines of symmetry- each one of its diameter is a line of symmetry. Thus, we define: If a line divided a given figure into two coincidental parts, then we say that the figure is symmetrical about the line and the line is called the axis of symmetry or line of symmetry.Įg: A line segment (say AB) is symmetrical about its perpendicular bisector (say PQ) as shown in the below figureĪn isosceles triangle ABC is symmetrical about the bisector AD of the angle included between the equal sidesĪ rectangle has two lines of symmetry, each one of which is the line joining the mid-points of opposite sides. Such figures are said to posses linear symmetry or reflection symmetry. ![]() REFLECTION SYMMETRY OR LINEAR SYMMETRYĬlearly, if each of these figures is folded along the dotted line, then the pair of the figure on one side of the dotted line falls exactly over the other part i.e., in each figure, the dotted line divides the figure into two coincident parts called the mirror images of each other. ![]()
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