3 ms·
The notion of "angle" does not really make much sense in topology. However, one could ask this question in context of inner product spaces where one can define
by xyzzyz 15y ago
The notion of "angle" does not really make much sense in topology. However, one could ask this question in context of inner product spaces where one can define an angle in a natural way, but all real 2-dimensional inner product spaces are essentially all alike, so the answer is negative as well.