Acute Triangle, each angle measures strictly less than 90 degree, Obtuse Triangle, measuring greater than 90 degree and two acute angles (less than 90 degree), Isosceles Triangle, with at least two congruent (equal) sides and two equal angles opposite those sides, Scalene Triangle, has no side are congruent., Median, a segment joining a vertex and the midpoint of the side opposite this vertex, Altitude, segment joining a vertex and is perpendicular to the side opposite this vertex, Angle Bisector, segment which bisects an angle of the triangle and whose endpoints are the vertex of this angle and a point on the opposite side., exterior angle, formed outside a polygon by extending one of its sides, interior angle, an angle located inside a closed shape or polygon, formed where two adjacent sides meet, adjacent interior angle, an angle which is adjacent and supplementary to the given exterior angle of the triangle.

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