Equilateral Triangle, All sides equal, Isosceles Triangle, Two sides equal, Scalene Triangle, No sides equal, Acute Triangle, All angles < 90°, Right Triangle, One angle = 90°, Obtuse Triangle, One angle > 90°, Equiangular Triangle, All angles and sides are equal, Hypotenuse, Longest side in right triangle, Vertex, a point where two straight lines intersect., Exterior Angle theorem, equal to the sum of the two opposite interior angles (remote interior angles)., Triangle Sum Theorem, the sum of the three interior angles in a triangle adds up to 180°..

Triangle Classification

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