A hexadecagon is a polygon with 16 sides and 16 vertices.
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A convex hexadecagon has 8 diagonals.
A 16 sided polygon is made from 14 triangles
An octagonal cupola is a type of polyhedron. Faces: 18 Edges: 40 Vertices: 24 The octagonal cupola is composed of one octagon, one hexadecagon, eight rectangles, and eight triangles.
If its a regular hexadecagon then each of its 16 exterior angles measures 22.5 degrees
A pentacontagon has 50 vertices (not vertices's!).