The vertex of an isosceles triangle having angle different from the two equal angles is called the apex of the isosceles triangle.
The common polygon vertex at the top of a pyramid or the vertex of a cone is also called an apex.
The vertex of an isosceles triangle having angle different from the two equal angles is called the apex of the isosceles triangle.
The common polygon vertex at the top of a pyramid or the vertex of a cone is also called an apex.
Weisstein, Eric W. "Apex." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Apex.html