Definition:Triangle (Geometry)/Isosceles/Apex

Definition

 * IsoscelesTriangle.png

The vertex opposite the base of an isosceles triangle is called the apex of the triangle.

In the above diagram, $A$ is the apex.

Also known as
The apex of an isosceles triangle is also called variously:


 * head angle
 * vertex

Neither of these terms is endorsed on for obvious reasons.