Theorem 2-1: Triangle-Angle Sum Theorem: The sum of the measures of the angles of a triangle is 180 degreees.
2-2: Exterior Engle Thm: The measure of each exterior angle of a triangle = the sum of the twp remote interior angles.
Equilateral: All sides are congruent
Isosceles: At LEAST 2 sides are congruent.
Scalene: no sides are congruent.
Equiangular: all angles are congruent.
Acute: ALL angles are acute.
Right: ONE right angle.
Obtuse: ONE obtuse angle.
What is the definition for Thm 2-1?