Term Definition
2 rays of the same line with a common endpoint and no other points in common opposite rays
angles that have the same measure congruent angles
a triangle that has 2 congruent sides isosceles triangle
a set of points consisting of 2 points on a line and all points on the line between these 2 points line segment
right triangle a triangle that has a measure of 90 degrees
any line or subset of a line that intersects a line segment at its midpoint bisector
the set of points all of which lie on a line colinear set of points
the absolute vaule of the difference of the coordinates of two points distance
a polygon hat has exactly 3 sides triangle
length of line segment the distance between the end points
the point that divides a segment into 2 congruent segments midpoint
a portion of a circle arc
a point is that is the same distance from each figure equidistant
the set of all points in a plane that are equidistant from a given point circle
a segment whose endpoints are the center and any point on a circle radius
a triangle where all sides are congruent equilateral triangle
a triangle with 3 unequal sides scalene triangle
a point where 2 or more straight lines or rays or segments meet vertex
an angle that has a measure of 180 degrees straight angle
an angle that has a measure greater than 0 and less than 90 degrees acute angle
an angle that has a measure greater than 90 and less than 180 degrees obtuse angle
2 lines that intersect to form right angles perpendicular lines
the angle formed by the legs of an isosceles triangle vertex angle
a segment from a vertex of a triangle to the midpoint of the opposite side median of a triangle
the perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side. altitude of a triangle
a ray that divides an angle into 2 angles that are congruent angle bisector

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