Question

which type of triangle will always have at least 1 - fold reflectional symmetry?
options: right triangle, acute triangle, isosceles triangle, obtuse triangle

Explanation:

Reflectional symmetry requires a line dividing the triangle into mirror-image halves. An isosceles triangle, by definition with at least two equal sides, has a line of symmetry along the altitude from the apex to the base, ensuring at least 1-fold reflectional symmetry. Other triangle types (acute, right, obtuse) can be scalene and lack such symmetry.

Answer:

isosceles triangle