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Geometry Vocabulary

Unit Review

Ray a part of a line that begins at a particular point (the endpoint) and extends forever in one direction
Line a two-dimensional object that has no endpoints and continues on forever in both directions
line segment part of a line connecting two points, it has definite end points
Angle the figure formed by two rays, called the sides of the angle, sharing a common endpoint (the vertex of the angle)
vertex the point at which the rays of an angle or the sides of a polygon meet; the plural form of the word is “vertexes” or “vertices”
acute angle an angle with a measure less than 90°
obtuse angle an angle with a measure more than 90°
right angle a 90° angle
straight angle a 180° angle
reflex angle an angle with a measure greater than 180° but less than 360°
adjacent angle two angles that are next to each other
congruent sides congruent sides or segments have the exact same length
adjacent sides two sides that share a common vertex
parallel lines lines that never meet; two parallel lines are always the same distance apart
perpendicular two lines that intersect at right angles
regular polygon a polygon in which all sides are the same length and all angles have the same measure
polygon a 2-dimensional figure formed by three or more line segments (sides) that meet only at their endpoints (vertices) to make a closed path; sides may not cross one another
quadrangle a polygon with four sides and four angles
equilateral triangle a triangle with all three sides equal in length, each angle of an equilateral triangle measures 60°
isosceles triangle a triangle with two sides equal in length
scalene triangle a triangle with no sides equal in length
right triangle a triangle with a right angle (90°)
acute triangle a triangle with three acute angles
obtuse triangle a triangle with one obtuse angle
rhombus a rhombus is a quadrilateral whose four sides are congruent; it has two pairs of parallel sides; squares are a type of rhombus with congruent angles
square a figure with four congruent sides and four right angles; a square is always a rhombus; all squares are considered rectangles
rectangle a figure with four sides and four right angles; opposite sides are parallel and congruent, a rectangle is sometimes a trapezoid; a rectangle is sometimes a square
trapezoid a quadrilateral with at least one pair of parallel sides
parallelogram a quadrilateral with two pairs of parallel sides; opposite sides have the same length and opposite angles have the same measure; all rectangles are parallelograms but not all parallelograms are rectangles because parallelograms do not necessarily ha
concave polygon a polygon with an angle measuring more than 180°; concave polygons look like they are collapsed or have one or more angles “dented” in
convex polygon a polygon is convex if there are no “dents” or indentations in it
Created by: hmcarew