Because it's perpencicular to its apex
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in an isosceles triangle
Only one line of symmetry, it is the line that contains the median of the isosceles triangle (that passes through the vertex and perpendicular to the base).
The base angles of an isosceles triangle are congruent.
The base angles of an isosceles triangle are congruent. The vertex angle of an isosceles triangle is not necessarily congruent to the base angles.
Two sides of an isosceles triangle are equal. The base is the other side.