hexagon
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/ \
\_/ ............. actually a hexagon has six SIDES not edges but a pyramid has 4 sides and SIX EDGES.
Space
A pentagon has 5 edges A hexagon has 6 edges A septagon has 7 edges
A tetrahedron has 6 edges
It is a pentagonal based pyramid that has 6 vertices, 6 faces and 10 edges
The hexagon at one end has 6 edges. The hexagon at the other end also has 6 edges. And then, there are 6 edges joining the two hexagons together. So, in all, there are 6+6+6 = 18 edges. A prism with bases that are n-gons has 3*n edges.
A pentagonal pyramid has 6 faces, 6 vertices and 10 edges.
A pentagonal based pyramid has 6 faces, ten edges and 6 vertices.
6 edges
6 edges
6 edges
6 edges No, 9 edges
A triangular pyramid has 6 edges.
A 6 sided hexagon has 6 sides but no edges