17 terms

Congruent

the same shape and size; two shapes are congruent if they can be turned or flipped so they can fit exactly into each other

Similar

the same shape, but different size

Symmetry

one half of a shape is exactly the same (mirror image) of the other

Parallel

two lines on a plane that never meet

Perpendicular

lines that are at right angles to each other

Plane Figure

2-dimensional shapes

Solid Figure

3-dimensional shapes

Prism

a solid figure with two parallel, congruent bases joined by rectangular faces. A prism is named by the shape of its bases

Bases

the opposite, congruent faces of a prism

Faces

the flat surfaces of a solid figure

Edges

the line segments that form when two faces meet

Vertices

the points where three or more edges meet

Rectangular Prism

a 3-dimensional shape with six faces

Volume

the amount of space taken up by an object

Cube

a 3-D shape with six rectangular faces

3D shapes

have three dimensions: length (L), width (W), and height (H)

Unit Cubes

have edges that are 1 unit long