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# Geometry Triangles

TermDefinition
equilateral triangle a triangle whose three sides are equal in length
isosceles triangle a triangle with two sides that are equal in length
scalene triangle a triangle whose three sides are all different in length
acute triangle a triangle whose 3 angles are all less than 90 degrees
equiangular triangle a triangle whose 3 angles are equal
right triangle a triangle with one angle of 90 degrees
obtuse triangle a triangle with an angle of more than 90 degrees
hypotenuse the side opposite the right angle in a right triangle
base of an isosceles triangle the side of an isosceles triangle that is not the legs (the two sides that are congruent)
base angles of an isosceles triangle the two congruent angles on an isosceles triangle
corollary a theorem that follows from another theorem
perpendicular bisector of a triangle a perpendicular line through the midpoint of a side of the triangle
angle bisector of a triangle a line that divides an angle of the triangle into two congruent parts
point of concurrency the point where three or more lines intersect
concurrent lines when three or more lines intersect in the same point
circumcenter of a triangle the point of concurrency of the perpendicular bisectors of a triangle
incenter of a triangle the point of concurrency of the angle bisectors
median of a triangle a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side
centroid of a triangle the point of concurrency of the three medians of a triangle
altitude of a triangle the perpendicular segment from a vertex to the opposite side or to the line that contains the opposite side
orthocenter of a triangle the point of concurrency of the three altitude lines
mid segment of a triangle a segment that connects the midpoints of two sides of a triangle
vertex angle of an isosceles triangle the angle that is not congruent to the others in an isosceles triangle
Created by: abby_eck