Yes and they all add up to 360 degrees
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Yes, a Triangle can have 3 obtuse EXTERIOR angles of measure 120° ONLY in the case of an equilateral Triangle. OTHERWISE, a Triangle always has 2 obtuse Exterior angles and 1 acute Exterior angle.
It is: 180-interior angle = exterior angle
At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle.
Interior angle+exterior angle = 180 degrees
It is the regular equilateral triangle whose each exterior angle is 120 degrees