heres the shape takeexam.next.ecollege.com/ec/courses/42071/CRS-MAT1002-3674588/ContentItem_77351157/image060.gif
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No, not all three-dimensional shapes have vertices. A vertex is an angle point of any shape. Spheres do not have vertices.
1 + number of sides/vertices the base shape has A square-based pyramid has 5 vertices, for example.
This all depends on the shape. Different shapes have different face, edges, vertices.
All you do is add up all the sides to find the perimeter even though it is a odd shape
what polygon has 6 edges 4 vertices and all faces meet at vertex