Which type of triangle will always have at least 1-fold reflectional symmetry?

An isosceles triangle has two equal sides, so reflecting it across the line from the vertex between those sides to the midpoint of the opposite side maps the triangle onto itself. An equilateral triangle is also isosceles and has reflectional symmetry. A right, obtuse, or acute triangle does not necessarily have equal sides, so its type alone does not guarantee reflectional symmetry.

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