They are two angles where either one arm of each angle is between the two arms of the other angle, or both arms of one angle are between the arms of the other.
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18 angles.
Infinite numbers of angles * * * * * Without overlapping, 2.
Take 2 overlapping circles representing a and b. The overlapping part is "and". The 2 parts not overlapping are a "or" b but not both. The 3 parts are a "or" b "or" both.
There are right angles, acute angles, obtuse angles, and straight angles.
90 degree angles.90 degree angles.90 degree angles.90 degree angles.