Vocabulary Unit 4 & 5

Equilateral/Equiangular Triangle A triangle with 3 congruent sides and 3 congruent angles

Isosceles Triangle A triangle with 2 congruent sides and 2 congruent angles

Scalene Triangle A triangle with no sides or angles congruent

Obtuse Triangle A triangle with exactly one obtuse angle

Right Triangle A triangle with exactly one right angle

Interior Angle An angle inside a triangle or polygon

Exterior Angle An angle outside a triangle or polygon

Perpendicular Bisector A ray, line, or line segment that is perpendicular to another line segment and goes through its midpoint

Angle Bisector A ray that divides an angle into 2 congruent angles

Median A segment that connects a vertex to the midpoint of the opposite side

Altitude A segment from a vertex to the opposite side that is perpendicular to that side Represents the height of a polygon

Point of Concurrency Three or more lines intersecting at a single (common) point

Midsegment A segment that connects the midpoints of the sides of a triangle Parallel to the 3 rd side and ½ its length