Acute Triangle - A triangle in which all of the angles are acute angles., Equiangular Triangle - A triangle with all angles congruent., Obtuse Triangle - A triangle with an obtuse angle., Right Triangle - A triangle with a right angle. The side opposite the right angle is called the hypotenuse. The other two sides are called legs., Equilateral Triangle - A triangle with all sides congruent., Isosceles Triangle - A triangle with at least two sides congruent. The congruent sides are called legs., Scalene Triangle - A triangle with no two sides congruent., Auxiliary Line - An extra line or segment drawn in a figure to help complete a proof., RemoteInteriorAngle - The angles of a triangle that are not adjacent to a given exterior angle., Congruent Polygon - Polygons in which all matching parts are congruent., Corresponding Parts - Matching parts of congruent polygons., Included Angle - In a triangle, the angle formed by two sides is the included angle for those two sides., Included Side - The side of a polygon that is a side of each of two angles.,

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