alleryThe axis of symmetry of an isosceles triangle is the perpendicular bisector of which part?
AThe apex angle
BOne of its legs
CA base angle
DIts base side
Answer & Solution
Correct answer: D. Its base side
1. An isosceles triangle has two equal legs and a third side called the base.
2. Its mirror line cuts the base at right angles through its midpoint and passes through the opposite vertex.
3. It splits the triangle into two congruent right triangles; it does not bisect a leg.
_Source: Wikipedia, Isosceles triangle, lead section_
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