Math Note

We have defined the edge of a 3-dimensional shape as the intersection of two flat faces (2 planes). The intersection of 3 or more edges as a vertex. It is argued whether or not a cone has an actual vertex since it has no straight edges and only one flat face (as opposed to a surface). Today we spoke of the cone having instead an apex. Tomorrow we will discuss a broader definition of the term vertex and the argument supporting the idea that a cone does in fact have a vertex (as sort of an intersection of an infinite number of planes). In any case, questions regarding cone vertices will not be counted on the test.