A polygon with seven sides is called a heptagon. A heptagon has seven interior angles totaling 9000 and seven exterior angles totaling 3600
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An angle cannot have 8 sides. If you're thinking of a shape with 8 sides, that's an octagon.
A right angle triangle.
right angle triangle
Those wouldn't be angle measurements, they would be sides. A triangle could be constructed with sides of those lengths.
For example, you might name an angle as "ABC", where "B" is the vertex, and "A" and "C" are points lying on the sides of the angle. If there are additional points on the same sides, you can substitute those points instead.