In a regular hexagon in which the angles are congruent you can use a formula.
((6-2)*180)/6
120 degrees.
The reason this works is that you can draw 4 diagonals inside the hexagon and triangles have 180 degrees each.
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A hexagon, in general can have an angle of any measure. In a REGUALR hexagon, each interior angle is 120o.
Providing that it is a regular 6 sided hexagon then each exterior angle measures 60 degrees
One interior angle of a hexagon is 120 degrees.
a hexagon with a refle angle
Providing that it's a regular 6 sided hexagon each interior angle measures 120 degrees