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ABOUT
ROUND
Round is shaped in a circle. Round is a shape having no edges. A circle
is a simple shape of Euclidean geometry consisting of those points
in a plane which are the same distance from a given point called the
centre. The common distance of the points of a circle from its center
is called its radius. A diameter is a line segment whose endpoints
lie on the circle and which passes through the centre of the circle.
The length of a diameter is twice the length of the radius. A circle
is never a polygon because it has no sides or vertices Circles are
simple closed curves which divide the plane into two regions, an interior
and an exterior. In everyday use the term "circle" may be used interchangeably
to refer to either the boundary of the figure (known as the perimeter)
or to the whole figure including its interior, but in strict technical
usage "circle" refers to the perimeter while the interior of the circle
is called a disk. The circumference of a circle is the perimeter of
the circle (especially when referring to its length). A circle is
a special ellipse in which the two foci are coincident. Circles are
conic sections attained when a right circular cone is intersected
with a plane perpendicular to the axis of the cone.
HISTORY
The circle has been known since before the beginning of recorded history.
It is the basis for the wheel, which, with related inventions such
as gears, makes much of modern civilization possible. In mathematics,
the study of the circle has helped inspire the development of geometry
and calculus.
Early science, particularly geometry and Astrology and astronomy,
was connected to the divine for most medieval scholars, and many believed
that there was something intrinsically "divine" or "perfect" that
could be found in circles. Some highlights in the history of the circle
are:
* 1700 BC – The Rhind papyrus gives a method to find the area of a
circular field.
* 300 BC – Book 3 of Euclid's Elements deals with the properties of
circles. * 1880 – Lindemann proves that is transcendental, effectively
settling the millennia-old problem of squaring the circle.
