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38 terms

Avondale Geo 3D

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polyhedron
a solid figure bounded by plane polygons or faces
face
cover the front or surface of
edge
a sharp side formed by the intersection of two surfaces of an object
vertex
the point of intersection of lines or the point opposite the base of a figure
regular polyhedron
any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
convex
curving or bulging outward
cross section
(physics) the probability that a particular interaction (as capture or ionization) will take place between particles
platonic solids
any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
tetrahedron
any polyhedron having four plane faces
octahedron
any polyhedron having eight plane faces
dodecahedron
any polyhedron having twelve plane faces
icosahedron
any polyhedron having twenty plane faces
prism
optical device having a triangular shape and made of glass or quartz
bases
compounds that reduce the concentration of hydrogen ions in a solution
lateral faces
the faces that are not the base of a parallelogram
right prism
each lateral edge is perpendicular to both bases
oblique prism
a prism that is not a right prism
surface area of a polyhedron
the sum of the areas of the faces of the polyhedron
lateral area of a polyhedron
the sum of the areas of its lateral faces
net
A two-dimensional pattern that can be folded to make a three-dimensional prism or pyramid
cylinder
a solid bounded by a cylindrical surface and two parallel planes (the bases)
right cylinder
a cylinder where the segment joining the centers of the bases is an altitude
lateral area of a cylinder
2πrh
surface area of a cylinder
2πrh+2πr²
pyramid
a massive memorial with a square base and four triangular sides
regular pyramid
a pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles
circular cone
has a circular base and a vertex that is not in the same plane as the base
lateral surface of a cone
pi r l
right cone
A cone in which a perpendicular line drawn from the base to the tip (vertex) passes through the center of the base
volume of a solid
lwh
sphere
any spherically shaped artifact
center of a sphere
The point inside a sphere that is the same distance from every point on the sphere.
radius of a sphere
a segment that has one endpoint at the center and the other endpoint on the sphere
chord of a sphere
a segment whose endpoints are on the sphere
diameter of a sphere
chord that contains the center
great circle
a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
hemisphere
either half of the cerebrum
similar solids
solids with the same shape and all their corresponding dimensions are proportional