Geometry Vocabulary

a quadrilateral with opposite sides parallel and equal in length

• Circle 

• Parallelogram 

• Triangle 

• Octagon 

a quadrilateral with at least one pair of parallel sides 

• triangle 

• trapezoid

• circle 

• square

triangle with at least one angle measuring above 90 degrees. 

• right triangle 

• acute triangle 

• obtuse triangle 

• isosceles 

a corner or point where 2 lines meet

• angle

• side

• vertex

  (vertices)

a 3-sided polygon

• pentagon

• hexagon

• octagon

• triangle

a 5-sided polygon

• pentagon

• hexagon

• octagon

• triangle

2 lines the same distance from each other that will never touch or cross

• regular

• parallel

• right angle

a closed shape with straight sides

• regular

• irregular

• polygon

• quadrilateral

a 4-sided polygon

• regular

• irregular

• polygon

• quadrilateral

a quadrilateral with all equal sides and all right angles

• rhombus

• rectangle

• square

• parallelogram