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Has the knowledge of isosceles triangle been tested in the mathematics of the senior high school entrance examination in Hebei Province in recent three years?
I have taken the exam for three years.

The knowledge of isosceles triangle is tested every year, which is a relatively basic knowledge.

An isosceles triangle is an axisymmetric figure, with only one axis of symmetry being a straight line higher than the base, and an equilateral triangle is an axisymmetric figure, with three axes of symmetry, that is, the middle perpendicular of three sides.