orthogonal drawing
the tw0-dimensional top, left, front, and right views of a three-dimensional object
corner view
the view from a corner of a three-dimensional figure
polyhedron
a three-dimensional figure bounded by polygons, called faces
face
flat side of a polyhedron
edges
line segments where the faces of a polyhedron meet
prism
a polyhedron with two congruent, parallel bases connected by parallelograms
bases
one of two faces of a polyhedron, which are congruent and parallel
regular prism
a right prism with bases that are regular polygons
pyramid
a three-dimensional figure with one base that is a polygon and triangular faces that meet at a point, called an apex
regular polyhedron
a polyhedron in which all faces are regular congruent polygons
cone
a three-dimensional figure formed by a circular base and a curved surface rising to a single point, called an apex
sphere
the set of all points in space equidistant from a given point, called the center
cross section
a two-dimensional shape formed in a plane by slicing that plane through a three-dimensional object
net
a two-dimensional figure that when folded forms the surfaces of a three-dimensional object
surface area
the sum of the areas of all faces and side surfaces of a three-dimensional figure
lateral faces
faces that are not bases
lateral edges
edges not part of the base
right prism
a prism with lateral edges that are also altitudes
oblique prism
a prism in which the lateral edges are not perpendicular to the bases
lateral area
for prisms, pyramids, cylinders, and cones, the area of the figure, not including the bases
right cylinder
a cylinder with an axis that is also an altitude
oblique cylinder
a cylinder that is not a right cylinder
axis (0f a cone)
segment with endpoints that are the vertex and the center of the base
regular pyramid
a right pyramid with a regular polygon as its base
slant height
the height of one of the faces of a pyramid or the length from a cone's base to the vertex, represented by a cursive l
right cone
a cone with an axis that is also an altitude
oblique cone
a cone that is not a right cone
great circle
for a given sphere, the intersection of the sphere and a plane that contains the center of the sphere
hemisphere
half of a sphere and the great circle that divides it
Platonic Solids
the five regular polyhedra: tetrahedron, hexahedron, octahedron, dodecahedron, or icosahedron
cylinder
a three-dimensional figure with two congruent, parallel circular bases
perspective view
the view of a three-dimensional figure from the corner
axis (of a cylinder)
segment with endpoints that are the centers of the bases