Johnson Solids (Page 1)
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(J7)
Elongated Triangular Pyramid
Vertices:
7 ({3 + 1}[3] + 3[4])
Faces:
7 ({3 + 1} equilateral triangles + 3 squares)
Edges:
12
Symmetry:
3-fold Pyramidal (C3v)
(values below based on edge length = 1)
Volume:
(sqrt(2)+3*sqrt(3))/12
≈0.55086383208997724412