If you want mathematical precision then the answer is that there need not be any angles at all and so there can be no angle relationship. Shapes like dumb-bells will tessellate, and these will have no angles. There are very many other shapes: see MC Escher's Symmetry artwork for examples.
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The interior angle of a regular polygon must be a factor of 360 degrees for it to tessellate uniformly.
It they weren't equal is wouldn't make a tessellation.
No, it is not possible.
It can be used only if the measure of its interior angle is a factor of 360 degrees.
A protractor is one of them