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A '''
cone''' is a basic shape in
geometry. Several things have also been called '''''cones''''' on account of their shape:
*A '''
volcanic cone''' is a mountain formed by material ejected from a
volcanic vent.
*In
relativity, the '''
light cone''' of an event consists of all
spacetime events that can interact with it.
*The scaly
fruit-like reproductive bodies of certain
plants, especially
conifers (Pinophyta) and
cycads (Cycadophyta), are called '''cones''': see '''
conifer cones''', and
Pinophyta.
*In
vertebrate anatomy, a '''
cone cell''' is a type of light-sensitive
cell found along with
rods in the
retina of the
eye.
* In
ceramics manufacture, a '''cone''' is a conical or
pyramidal mineral stick that is used to gauge the
temperature of an
oven.
*An '''
ice cream cone''' is a container for
ice cream, shaped like an inverted cone open at its top. It is often made of edible
pastry.
*A '''
traffic cone''' is a brightly colored cone-shaped plastic object commonly used as a temporary traffic barrier or warning sign.
*In
basketball, a cone is a player who is so slow and unskilled, that you can dribble around them as if they were a traffic cone.
The word '''cone''' and its derivatives also have several specialized meanings in
mathematics:
*In
geometry, '''cone''' is often used informally for
conical surface, usually a right circular one; see
cone (geometry).
*Also in
geometry, the '''cone of''' an arbitrary set <math>X</math> means the union of all
line segments connecting a fixed point to points of <math>X</math>. For exmple, this '''coning''' operation will turn a
triangle into a
tetrahedron.
*In
topology, too, '''coning''' may be applied to a
topological space, e.g. to define the
barycentric subdivision of a
cell complex; see
cone (topology).
*In
linear algebra, the '''
convex cone''' of a set of
vectors consists of all
linear combinations of those vectors with non-negative coefficients.
*In
descriptive geometry, "'''conical projection'''" is another name for the
perspective projection.
*In
cartography, however, a '''
conical projection''' maps the
spherical surface of the
Earth to a
conical surface, that is then
unrolled onto a plane.
*A '''
conic section''' is any curve obtained by cutting the surface of a cone (more precisely, a
conical surface) by an arbitrary plane.
The formula for the volume of cone is
1/3(Area of Base)(height) = 1/3 π r2 h
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