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An irregular heptagon is one in which at least one of the sides or at least one of the angles is different from the rest.
yes
If you meen the three angles, all tirangles angles add to 180 degrees. But all of the angles must be different, that's what makes it an acute triange. So three.
A scalene triangle
There are at least 28 different pairs of angles: 66 if the first two lines are not parallel. Your question needs to be more specific as to which angles you mean.