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cone
13 The correct answer is 12. From any one vertex, you can draw a diagonal to all but 3 vertices: the vertex itself and the next vertex on either side of your vertex (these would be sides of your shape, not diagonals).
The number of Diagonals in one vertex of a Triangle is 0 (zero)..
A cone has one circular base and a vertex that is not on the base.as described on math.com
A diagonal in a shape is a straight line from one vertex to another vertex (corner).