Double cone is two cones joined at their apex.
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The point of attatchment between two chromatids is called the centromere. When two chromatids are connected, it is called a chromosome which is essential in DNA replication, or, mitosis.
You cannot because the volumes of the cones also depend on their heights.
The common point is called the intersection.
If two sides meet at a POINT then it is a vertex or corner.
The point where two lines form an angle is called the vertex.