An angle cannot have 8 sides. If you're thinking of a shape with 8 sides, that's an octagon.
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I'm assuming you mean a shape with 8 sides or angles. If so, you are speaking about an octogon.
To work out the angle of any 'perfect shape' you use this formula: interior angle =((number of sides - 2) x 180)/ number of sides for an octagon: interior angle =((8-2) x 180 )/ 8 = 135 degrees
A right angle triangle.
right angle triangle
8 sides