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Geometry Vocabulary

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