# Ch. 5 Math Vocabulary - 2

 The sum of the angles in EVERY triangle is 180 degrees Triangle Sum Theorem Triangle has 3 acute angles Acute Triangle that has 2 acute angles and 1 obtuse angle Obtuse Triangle that has 2 angles and 1 right angle Right Triangle that has 3 congruent sides Equilateral Triangle that has 2 congruent sides Isosceles Triangle that has NO congruent sides Scalene The sum of the lengths of any 2 sides of a triangle must be greater than the length of the 3rd side Triangle Inequality Theorem Lines in a plane that never intersect are called Parallel lines Lines in a plane that form right angles when they intersect are called Perpendicular lines A line that passes through 2 or more lines Transversal For two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and on the same sides of the other two lines Corresponding angles For two lines intersected by a transversal, a pair of angles that lie on opposite sides of the transversal and outside the other two lines Alternate exterior angles For two lines intersected by a transversal, a pair of nonadjacent angles that lie on opposite sides of the transversal and between the other two lines Alternate interior angles AuthorBJHS ID336418 Card SetCh. 5 Math Vocabulary - 2 DescriptionCh. 5 Math Vocabulary - 2 Updated2017-12-05T19:22:23Z Show Answers