There are several: hyperbolic, elliptic and projective are three geometries.
Elliptic and Hyperbolic geometry.
Linear
Answer The two commonly mentioned non-Euclidean geometries are hyperbolic geometry and elliptic geometry. If one takes "non-Euclidean geometry" to mean a geometry satisfying all of Euclid's postulates but the parallel postulate, these are the two possible geometries.
false
There are several: hyperbolic, elliptic and projective are three geometries.
There are two non-Euclidean geometries: hyperbolic geometry and ellptic geometry.
Elliptic and Hyperbolic geometry.
Linear
Answer The two commonly mentioned non-Euclidean geometries are hyperbolic geometry and elliptic geometry. If one takes "non-Euclidean geometry" to mean a geometry satisfying all of Euclid's postulates but the parallel postulate, these are the two possible geometries.
false
Hyperbolic, elliptic, projective are three possible answers.
Objet Geometries was created in 1999.
Five and six coordinate geometries are special because of the number of valence electrons. Five coordinate geometries have ten valence electrons while six coordinate geometries have six.
A Plane triangle cannot have parallel sides. A triangle on a sphere, represented in Mercator projection may do so, but that still does not make it so, for that is in spherical geometry. And there are other geometries than Euclidean (plane). Hyperbolic Geometry and Elliptic Geometry are the names of another two. These geometries are consistent within themselves, but some of the theorems in Euclidean geometry have different answers in these alternate geometries.
Not in Euclidean geometry, but in other geometries such lines are possible.
Trigonal planar and tetrahedrral geometries tend to be present in polar molecules.