A figure that has matching parts when divided by a line is said to have a line of symmetry. These figures are also called symmetrical and their center of gravity lies along the line of symmetry.
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A line of symmetry
Shapes that can be divided into two equal parts are called "symmetrical" or "mirror image" shapes. When a shape can be divided into two equal halves that perfectly match each other, it is said to have reflectional symmetry. Examples of such shapes include squares, rectangles, circles, and triangles, as they can be divided into two equal parts along a line of symmetry.
A bisector is a line or curve which bisects or divides a line segment, angle or other figure into two equal parts.
Well, when you divide you get fraction, the thing above the line is called your numerator and the thing below your line is called the denominator. Then, your numerator is divided by you denominator. For example, 10/2 where 10 is your numerator and 2 is your denominator this mean 10 divided by 2 =5
a figure that has a line drawn horizontally across the figure