A shape has line symmetry (bilateral symmetry) if a line divides it into two mirror halves. Test: fold the shape along the line โ if edges match perfectly, it has line symmetry. Lines of symmetry for common shapes: Square: 4, Rectangle: 2, Equilateral triangle: 3, Isosceles triangle: 1, Scalene triangle: 0, Circle: infinite. Letters with line symmetry: A, H, I, M, O, T, U, V, W, X, Y.
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