A hexagonal pyramid is one possibility.
A pentagonal bi-pyramid is another.
There are others.
A cuboid douses have 8 verticess and 12 edges.
heptahedron
Square pyramid: 5 Cube: 6
What is the 3d name for octagon
A 3d trapezium (not trapesium) does not have a specific name.
3d + 8 = 2d - 7 3d -2d = -8 - 7 1d = - 15 d = -15
Pentagonal prism.
A 3D name for a pentagon is a pentagonal prism.
hexahedron is the name of a 3d hexagon
Type in your name in 3D and it will come up with options.
3d+8=2d-7 3d+8-8=2d-7-8 (substract 8 on both side) 3d=2d-15 3d-2d=2d-2d-15 (substract 2d on both side) d=-15
A Pyramid is a 7 lettered 3D shape with triangular faces.