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Geometry Vocabulary

TermDefinition
triangle a polygon with 3 sides
acute triangle 3 sided polygon with all acute angles
right triangle A triangle with one right angle
right angle perfect 90 degrees (corner)
equilateral triangle all equal sides, 3 sided polygon
isosceles triangle triangle with 2 equal sides
scalene triangle a triangle with no equal sides
plane figure a 2D flat shape
polygon A figure with all straight sides, no openings, no intersections
Quadrilateral any 4 sided polygon
Pentagon Any 5 sided polygon
Hexagon Any 6 sided polygon
Parallel two lines that will never meet if extended in both directions
Perpendicular two lines that intersect to make a right angle
2 pairs of parallel sides Two SETS of parallel sides
Isosceles trapezoid a trapezoid with 2 equal sides
Parallelogram A quadrilateral with two pairs parallel sides
Congruent Equivalent
Rectangle A quadrilateral with all right angles
Square A quadrilateral with all right angles and congruent sides
Rhombus A quadrilateral with congruent sides
Line of symmetry Imaginary line where you could fold the figure and have both sides match up
Diagonal Sides in a figure that are opposite of one another
Classification To group something according to attributes or characteristics
Figure A shape (2D or 3D)
Diagram A picture/chart
Kite A quadrilateral with two pairs of adjacent sides that are congruent
Adjacent Sides that are next to one another (share a vertex)
Vertex Where two sides meet (a corner)
Vertices The plural form of vertex
Properties special characteristics
Attributes Special characteristics or properties
Category (Categories) Specific group
Subcategory (subcategories) Specific groups within a group
angles the spaces, measured in degrees, between two lines connected at a vertex.
Regular Polygon All sides and angles are congruent
Created by: rothl