the third side is the base of an isosceles triangle.
the third side is the base of an isosceles triangle.
what is the base of an isosceles triangle?
the third side
in an isosceles triangle that has exactly two equal sides, the equal sides are called legs and the third side is called the base. the angle included by the legs is called the "vertex angle" and the angles that have the base as one of their sides are called the "base angles". the vertex opposite the base is called the apex. in the equilateral triangle case, since all sides are equal, any side can be called the base.
isosceles triangle
bullet::::- an "isosceles triangle" has two sides of equal length. an isosceles triangle also has two angles of the same measure, namely the angles opposite to the two sides of the same length; this fact is the content of the isosceles triangle theorem, which was known by euclid. some mathematicians define an isosceles triangle to have exactly two equal sides, whereas others define an isosceles triangle as one with "at least" two equal sides. the latter definition would make all equilateral triangles isosceles triangles. the 45–45–90 right triangle, which appears in the tetrakis square tiling, is isosceles.
triangle