Geometry Vocabulary

Any polygon with five sides, angles, vertices

• quadrilateral

• polygon

• hexagon

• pentagon

Any polygon with six sides, angles, vertices

• parallelogram

• polygon

• hexagon

• pentagon

Any polygon with eight sides, angles, vertices

• octagon

• polygon

• hexagon

• pentagon

Same size, same shape

• congruent

• equilateral

• equal

• square

Lines that intersect and form a right angle

• perpendicular

• parallel

• congruent

• right

Lines that are the same distance apart and never intersect

• perpendicular

• parallel

• congruent

• parallelogram

Quadrilateral with four sides same length and four right angles

• polygon

• parallelogram

• square

• rectangle

Triangle with at least two sides same length

• isosceles

• equilateral

• scalene

• acute

Two-dimensional shape that is NOT classified as a polygon

• circle

• square

• trapezoid

• rhombus

Triangle with one angle larger than 90 degrees

• obtuse

• acute

• isosceles

• scalene