two-dimensionalHaving only two

dimensions, example length

and width.

three-dimensional

Having three dimensions:

depth, width, and height.

rectangleA parallelogram with four right

angles.

squareA rectangle with four congruent

sides.

trapezoidA quadrilateral with one pair of

parallel sides.

composite figureA figure made up of two or more

geometric shapes.

areaThe number of

square units needed to cover a given surface.

perimeterThe distance

around a shape.

surface areaThe sum of the areas of the faces of a 3D figure. Measured in

square units.

volumeThe number of units needed to fill a given space. Measured in

cubic units.

27 units3

polyhedronA three-dimensional

figure in which all the surfaces or faces are

polygons.

netAn arrangement of two-dimensional

figures that can be folded to form a

polyhedron.

faceA flat surface

of a polyhedron.

baseThe face on

which a solid stands.

edgeWhere two faces of a

polyhedron meet.

vertexIn a polyhedron, the point where three or more edges meet.

rectangular prism

A polyhedron with two congruent

rectangular bases and other faces that are all

parallelograms.

triangular prismA polyhedron that has

two congruent triangle-shaped bases and other faces that

are all parallelograms.

rectangular pyramid

A polyhedron consisting of a

rectangular base and triangular faces that meet at a common

vertex.

triangular pyramid

A polyhedron consisting of a

triangular base and triangular faces that meet at a common

vertex.