Symmetry
A 2D shape is symmetrical if a line can be drawn through it so that either side of the line looks exactly the same.
The line is called a line of symmetry.
This is sometimes called a 'mirror line' or 'mirror symmetry', because if you put a mirror on the line, the reflection would show the whole shape.
鈥 An isosceles triangle has 1 line of symmetry.
鈥 A square has 4 lines of symmetry.
鈥 A circle has unlimited lines of symmetry!
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