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# Geometry

### Geometry Vocab

TermDefinition
polygon a closed figure made up of line segments that do not cross each other
regular polygon a polygon with congruent sides and congruent angles
congruent sides sides that are equal in length
congruent angles angles that have the same degree measure
triangle a polygon with three sides and three angles
quadrilateral a polygon with four sides and four angles
pentagon a polygon with five sides and five angles
hexagon a polygon with six sides and six angles
octagon a polygon with eight sides and eight angles
attribute a characteristic of a figure like side measures and angle measures
isosceles triangle a triangle with at least two congruent sides
equilateral triangle a triangle with all sides congruent
scalene triangle a triangle with no congruent sides
acute triangle a triangle with three acute angles
right triangle a triangle with one right angle and two acute angles
obtuse triangle a triangle with one obtuse angle and two acute angles
trapezoid a quadrilateral with exactly one pair of opposite sides that are parallel
rectangle a parallelogram with four right angles
parallelogram a quadrilateral with opposite sides congruent and parallel
square a parallelogram with four congruent sides and four right angles
rhombus a parallelogram with four congruent sides
three-dimensional figure a figure with length, width, and height
net a two-dimensional pattern of a three-dimensional figure
cube a three-dimensional figure with six faces that are congruent squares, has twelve edges and eight vertices, also called a square prism
congruent figures figures that have the same size and shape
rectangular prism a three-dimensional figure with six rectangular faces and opposite faces that are parallel and congruent
face a flat surface
edge where two faces meet
vertex a point where three or more faces meet
prism a three-dimensional figure that has at least three faces that are rectangles
bases the top and bottom faces
rectangular prism a prism with bases that are congruent rectangles, has six rectangular faces, twelve edges, and eight vertices
triangular prism a prism with triangular bases, has five faces, nine edges, and six vertices
volume the amount of space inside a three-dimensional figure
composite figure made up of two or more three-dimensional figures
Created by: Jerman