Geometry Chapter 10 Vocab Only
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altitude of a prism
A segment with its endpoints on the planes of the bases that is perpendicular to the planes of the bases.

altitude of a cone
A segment from the vertex to the plane of the base that is perpendicular to the plane of the base.

altitude of a pyramid
A segment from the vertex to the plane of the base that is perpendicular to the plane of the base.

axis of a cone
The segment with endpoints at the vertex and the center of the base.

axis of a cylinder
The segment with endpoints at the centers of the two bases.

center of a sphere
The point inside a sphere that is the same distance from every point on the sphere.

cone
A threedimensional figure with a circular base and a curved lateral surface that connects the base to a point called the vertex.

cross section
The intersection of a three dimensional figure and a plane.

cube
A prism with six square faces.

cylinder
A threedimensional figure with two parallel congruent circular bases and a curved lateral surface that connects the bases.

edge of a threedimensional figure
A segment that is the intersection of two faces of the figure.

face of a polyhedron
A flat surface of the polyhedron.

great circle
A circle on a sphere that divides the sphere into two hemispheres.

hemisphere
Half of a sphere.

horizon
The horizontal line in a perspective drawing that contains the vanishing point(s).

isometric drawing
A way of drawing threedimensional figures using isometric dot paper, which has equally spaced dots in a repeating triangular pattern.

lateral edge
An edge of a prism or pyramid that is not an edge of a base.

lateral face
A face of a prism or a pyramid that is not a base.

lateral surface
The curved surface of a cylinder or cone.

net
A diagram of the faces of a threedimensional figure arranged in such a way that the diagram can be folded to form the threedimensional figure.

oblique cone
A cone whose axis is not perpendicular to the base.

oblique cylinder
A cylinder whose axis is not perpendicular to the bases.

oblique prism
A prism that has at least one nonrectangular lateral face.

orthographic drawing
A drawing that shows a threedimensional object in which the line of sight for each view is perpendicular to the plane of the picture.

perspective drawing
A drawing in which nonvertical parallel lines meet at a point called a vanishing point. Perspective drawings can have one or two vanishing points.

polyhedron
A closed threedimensional figure formed by four or more polygons that intersect only at their edges.

prism
A polyhedron formed by two parallel congruent polygonal bases connected by lateral faces that are parallelograms.

pyramid
A polyhedron formed by a polygonal base and triangular lateral faces that meet at a common vertex.

radius of a sphere
A segment whose endpoints are the center of a sphere and any point on the sphere; the distance from the center of a sphere to any point on the sphere.

regular pyramid
A pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles.

right cone
A cone whose axis is perpendicular to the base.

right cylinder
A cylinder whose axis is perpendicular to its bases.

right prism
A prism whose lateral faces are all rectangles.

slant height of a regular pyramid
The distance from the vertex of a regular pyramid to the midpoint of an edge of the base.

slant height of a right cone
The distance from the vertex of a right cone to a point on the edge of the base.

space
The set of all points in three dimensions.

sphere
The set of points in space that are a fixed distance from a given point called the center of the sphere.

surface area
The total area of all faces and curved surfaces of a threedimensional figure.

vanishing point
In a perspective drawing, a point on the horizon where parallel lines appear to meet.

vertex of a threedimensional figure
The point that is the intersection of three or more faces of the figure.

vertex of a cone
The point opposite the base of the cone.

vertex of a pyramid
The point opposite the base of the pyramid.

volume
The number of nonoverlapping unit cubes of a given size that will exactly fill the interior of a threedimensional figure.