alleryA triangle with a line of symmetry is always what kind of triangle?
AScalene
BIsosceles
CObtuse
DAcute
Answer & Solution
Correct answer: B. Isosceles
1. A line of symmetry swaps two corners and so two sides must be equal.
2. A triangle with two equal sides is isosceles.
3. Scalene has no equal sides and no mirror line; obtuse and acute only describe angles, not symmetry.
_Source: Wikipedia, Reflection symmetry, section Symmetric geometrical shapes_
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