The geometry of similarity in the Euclidean plane or Euclidean space.
point, line and plane
yes, a square can only exist on a plane in euclidean geometry.
In Euclidean plane geometry every triangle MUST BE coplanar.
No, not in plane (Euclidean) geometry.
The geometry of similarity in the Euclidean plane or Euclidean space.
Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few
Geometry that is not on a plane, like spherical geometry
Geometry that is not on a plane, like spherical geometry
Not in plane Euclidean geometry.
a plane
point, line and plane
yes, a square can only exist on a plane in euclidean geometry.
In Euclidean plane geometry every triangle MUST BE coplanar.
No, not in plane (Euclidean) geometry.
In Euclidean geometry point, line and plane are not defined.
Assuming you are referring to a triangle. In Euclidean, or plane geometry, always to 180 degrees. In non-Euclidean geometry either more or less than 180 degrees.