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Chapter 12 flashcards
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Gravity
Terms in this set (38)
face
a surface forming part of the outside of an object
edge
a line in which two or more segments meet
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
a section created by a plane cutting a solid perpendicular to its longest axis
Platonic solids
tetrahedron, cube, regular octahedron, regular dodecahedron, regular icosahedron
tetrahedron
any polyhedron having four plane faces
octahedron
any polyhedron having eight plane faces
dodechahedron
a twelve sided figure
icosahedron
any polyhedron having twenty plane faces
prism
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
bases
the polygons in which the line segments meet at
lateral faces
the faces that are not the base of a parallelogram
right prism
a prism whose lateral faces are rectangles
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 the lateral faces of a polyhedron.
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 polyhedron having a polygonal base and triangular sides with a common vertex
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
LSA = ½PL
P is the perimeter/circumference of the base, L is the slant height
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
lenght X width X height
sphere
a three-dimensional closed surface such that every point on the surface is equidistant from the center
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
a segment passing through the center, with endpoints on the sphere
great circle
a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
hemisphere
half a sphere
similar solids
solids with the same shape and all their corresponding dimensions are proportional
polyhedron
a solid figure bounded by plane polygons or faces
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