The measure of an exterior angle of a triangle is more than the measure of the intersection of two straight lines.
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no it dose not
Such is called an exterior angle. A useful theorem is that an exterior angle is equal to the sum of its non adjacent interior angles.
Yes, all plane triangle.
Yes, if you interpret some of the exterior angles as having negative measure.
360 divided (180-n) This uses the exterior angle theorem and linear pair theorem. This works on regular polygons. All the angles congruent.