An isosceles triangle.
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An equilateral triangle has 3 lines of symmetry, while an isosceles triangle has only one, and any other triangle (non-isosceles right triangle, or scalene triangle) has zero.
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an irregular hexagon... __/\__ \ / \ / \ /
A kite.
Ah, what a lovely question! A shape with 5 sides and 1 line of symmetry is called a pentagon. It's like a beautiful little house with one side that can be folded perfectly in half to match up. Isn't it just delightful to explore the symmetry and harmony in nature's creations?
An isosceles trapezoid has 1 vertical line of symmetry
scalene triangle.