Symmetry is a shape, object or drawing that on both sides are exactly the same! So a square, rectangle, circle, diamond, and more.
When you draw something like a square cut it out and see how many times you can fold it. If you can fold it one time that fold represents a line of symmetry! A heart ❤️ has one line of symmetry. If you can not fold it with equal parts on both sides then it does not have a line of symmetry.
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Here are 5 shapes that has 1 line of symmetry or so; Circle [ Undefined Infinite ], heart, square, octagon, and rectangle.
An isosceles triangle has one line of symmetry
a symmetrical shape
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
Trapezium
a pentagon