Not necessarily. You can have, for example, a hexagon with angles measuring 95, 105, 115, 125, 135 and 145 degrees.
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escoscolipse
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.
A hexagon has no right angles what-so-ever.
No, An equilateral triangle has 3 congruent angles, an isosceles triangle has 2 congruent angles, a scalene triangle has no congruent angles.
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.