Square, hexagon, octagon, rectangle, bowtie-shaped figure, etc.
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You approximate your irregular figure lots of small figures of known shapes. For example, you can divide it into lots of thin vertical (or horizontal) stripes, each of which is approximately a rectangle.
An equilateral triangle has exactly 3 lines of symmetry.
Not at all. There are an infinite number of figures that have two lines of symmetry. For a start, an ellipse.
sphere
Here are just some: Triangle, trapezoid, cone