High School Geometry Vocabulary

a FOUR sided polygon

• Triangle

• Quadrilateral 

• Circle 

• Line

an EIGHT sided polygon

• octagon

• pentagon

• triangle 

• rhombus

a triangle with no sides the same length

• Scalene

• Isosceles 

• Equilateral 

• Rhombus

a triangle with three acute angles

• Acute Triangle 

• Obtuse Triangle 

• Right Triangle 

• Left Triangle 

a parallelogram with four sides equal in length 

• Rhombus 

• Triangle 

• Circle 

• Line

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 quadrilateral with one set of parallel sides

• rhombus

• rectangle

• trapezoid

• parallelogram

a quadrilateral where opposite sides are parallel

• rhombus

• rectangle

• trapezoid

• parallelogram

a corner or point where 2 lines meet

• angle

• side

• vertex

  (vertices)