Geometry Academic Vocabulary

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 

One fixed endpoint and extends infinitely along the line from the endpoint.

• array

• line segment

• ray

• line

Which word does the figure above model?

• array

• line segment

• ray

• line

When lines meet or cross at some point they are called

• interior

• parallel

• intersecting

• perpendicular

Attributes are

• being an equal distance apart without ever touching

• information that determines the properties of something

• any four-sided figure

• when one shape becomes exactly like another after a flip, slide, or turn (mirror image)