truncated cube
polygon
triangular
square
regular icosahedron
shaped
superpose
photostatically
lensoidal
construct
presymplectic
exterior angle
triangularity
quadratic
external angle
axis of symmetry
topomorphological
fractal geometry
conic
conoid
conic section
circumconics
regular tetrahedron
roughcast
Riemann
metageometric
plane geometry
Georg Friedrich Bernhard Riemann
Bernhard Riemann
plane of symmetry
Euclidian space
planal
quadrangularly
cubangular
truncated tetrahedron
conicohemispherical
morphology
cubiform
primitive
intercone
spherical trigonometry
hypergeometry
geometric